32:I[196793,["/_next/static/chunks/03tmy10hekekp.js?dpl=nogit-1791968216","/_next/static/chunks/2_6olli-sutu3.js?dpl=nogit-1791968216","/_next/static/chunks/1qp4g--o6-1vf.js?dpl=nogit-1791968216","/_next/static/chunks/0psy-n5us57a4.js?dpl=nogit-1791968216","/_next/static/chunks/3mz725-y91ph6.js?dpl=nogit-1791968216","/_next/static/chunks/2x_dbpl3b_l2r.js?dpl=nogit-1791968216","/_next/static/chunks/0nojijad0occ8.js?dpl=nogit-1791968216","/_next/static/chunks/19ua1o9n5v3ho.js?dpl=nogit-1791968216","/_next/static/chunks/0zkcxwtbsqliz.js?dpl=nogit-1791968216","/_next/static/chunks/3yfg2hrj9oxbd.js?dpl=nogit-1791968216","/_next/static/chunks/35s1d7gs3nyqk.js?dpl=nogit-1791968216","/_next/static/chunks/38w1x0vrld4-w.js?dpl=nogit-1791968216","/_next/static/chunks/3jpl-42mbad5n.js?dpl=nogit-1791968216","/_next/static/chunks/3kzt2piec6aoa.js?dpl=nogit-1791968216","/_next/static/chunks/2lsi6eli88uwt.js?dpl=nogit-1791968216","/_next/static/chunks/2os7nxouq91eq.js?dpl=nogit-1791968216","/_next/static/chunks/3ml3vooxhiupb.js?dpl=nogit-1791968216","/_next/static/chunks/04zr-wqafvwoa.js?dpl=nogit-1791968216","/_next/static/chunks/36r9y5g_s4k64.js?dpl=nogit-1791968216","/_next/static/chunks/40lyu17d590zu.js?dpl=nogit-1791968216","/_next/static/chunks/2g-t2n9ahs3tn.js?dpl=nogit-1791968216","/_next/static/chunks/2mv9l1xl_aa4j.js?dpl=nogit-1791968216","/_next/static/chunks/44w2c3xxfw4wd.js?dpl=nogit-1791968216","/_next/static/chunks/16jtsbm2g52s0.js?dpl=nogit-1791968216","/_next/static/chunks/05mo4k9k-ry1n.js?dpl=nogit-1791968216","/_next/static/chunks/0v4byuex1x38h.js?dpl=nogit-1791968216","/_next/static/chunks/2eanemqjnv2vr.js?dpl=nogit-1791968216","/_next/static/chunks/2f3ohq_f1uov2.js?dpl=nogit-1791968216","/_next/static/chunks/0llqhg6-bxn_b.js?dpl=nogit-1791968216","/_next/static/chunks/2dx-vzwyw9a3g.js?dpl=nogit-1791968216","/_next/static/chunks/0qeo40bqomvxa.js?dpl=nogit-1791968216","/_next/static/chunks/1ku-vdy4ggo41.js?dpl=nogit-1791968216","/_next/static/chunks/1coblm1-go81_.js?dpl=nogit-1791968216","/_next/static/chunks/27ftpb6yvr6lz.js?dpl=nogit-1791968216","/_next/static/chunks/0k-y_4mcfub-p.js?dpl=nogit-1791968216","/_next/static/chunks/3zy87rvkige3i.js?dpl=nogit-1791968216","/_next/static/chunks/3it1o0ex-l5qz.js?dpl=nogit-1791968216","/_next/static/chunks/2gqripb6ybmw9.js?dpl=nogit-1791968216","/_next/static/chunks/2l63yczi1z2qz.js?dpl=nogit-1791968216","/_next/static/chunks/075i0tnxt4not.js?dpl=nogit-1791968216","/_next/static/chunks/1eyu-5752jh17.js?dpl=nogit-1791968216","/_next/static/chunks/1vka20opca5jn.js?dpl=nogit-1791968216","/_next/static/chunks/3f11o876enqgd.js?dpl=nogit-1791968216","/_next/static/chunks/13gj59kzq50t_.js?dpl=nogit-1791968216","/_next/static/chunks/1986062z5zb0v.js?dpl=nogit-1791968216","/_next/static/chunks/0uitbylhcd4am.js?dpl=nogit-1791968216","/_next/static/chunks/0wv8cpdr6cvhr.js?dpl=nogit-1791968216","/_next/static/chunks/06b61oz__qen3.js?dpl=nogit-1791968216","/_next/static/chunks/0a4x2f2g83l7b.js?dpl=nogit-1791968216","/_next/static/chunks/1lsxkfxy262n-.js?dpl=nogit-1791968216","/_next/static/chunks/3q5gc8lbwr4b4.js?dpl=nogit-1791968216","/_next/static/chunks/0dspbdeiizrn3.js?dpl=nogit-1791968216","/_next/static/chunks/2yss1g0cimuwe.js?dpl=nogit-1791968216","/_next/static/chunks/0e7v08pdxbxe2.js?dpl=nogit-1791968216","/_next/static/chunks/36nndwkz7iik3.js?dpl=nogit-1791968216","/_next/static/chunks/0zg1om_k0m5zv.js?dpl=nogit-1791968216","/_next/static/chunks/2fnth9-t6i7kd.js?dpl=nogit-1791968216","/_next/static/chunks/24srd-xd1m5z8.js?dpl=nogit-1791968216","/_next/static/chunks/0a57o9qvnv-nb.js?dpl=nogit-1791968216","/_next/static/chunks/41hx021qkamew.js?dpl=nogit-1791968216","/_next/static/chunks/1ksyn9m68446d.js?dpl=nogit-1791968216"],"Gingerbread"] 34:I[647935,["/_next/static/chunks/03tmy10hekekp.js?dpl=nogit-1791968216","/_next/static/chunks/2_6olli-sutu3.js?dpl=nogit-1791968216","/_next/static/chunks/1qp4g--o6-1vf.js?dpl=nogit-1791968216","/_next/static/chunks/0psy-n5us57a4.js?dpl=nogit-1791968216","/_next/static/chunks/3mz725-y91ph6.js?dpl=nogit-1791968216","/_next/static/chunks/2x_dbpl3b_l2r.js?dpl=nogit-1791968216","/_next/static/chunks/0nojijad0occ8.js?dpl=nogit-1791968216","/_next/static/chunks/19ua1o9n5v3ho.js?dpl=nogit-1791968216","/_next/static/chunks/0zkcxwtbsqliz.js?dpl=nogit-1791968216","/_next/static/chunks/3yfg2hrj9oxbd.js?dpl=nogit-1791968216","/_next/static/chunks/35s1d7gs3nyqk.js?dpl=nogit-1791968216","/_next/static/chunks/38w1x0vrld4-w.js?dpl=nogit-1791968216","/_next/static/chunks/3jpl-42mbad5n.js?dpl=nogit-1791968216","/_next/static/chunks/3kzt2piec6aoa.js?dpl=nogit-1791968216","/_next/static/chunks/2lsi6eli88uwt.js?dpl=nogit-1791968216","/_next/static/chunks/2os7nxouq91eq.js?dpl=nogit-1791968216","/_next/static/chunks/3ml3vooxhiupb.js?dpl=nogit-1791968216","/_next/static/chunks/04zr-wqafvwoa.js?dpl=nogit-1791968216","/_next/static/chunks/36r9y5g_s4k64.js?dpl=nogit-1791968216","/_next/static/chunks/40lyu17d590zu.js?dpl=nogit-1791968216","/_next/static/chunks/2g-t2n9ahs3tn.js?dpl=nogit-1791968216","/_next/static/chunks/2mv9l1xl_aa4j.js?dpl=nogit-1791968216","/_next/static/chunks/44w2c3xxfw4wd.js?dpl=nogit-1791968216","/_next/static/chunks/16jtsbm2g52s0.js?dpl=nogit-1791968216","/_next/static/chunks/05mo4k9k-ry1n.js?dpl=nogit-1791968216","/_next/static/chunks/0v4byuex1x38h.js?dpl=nogit-1791968216","/_next/static/chunks/2eanemqjnv2vr.js?dpl=nogit-1791968216","/_next/static/chunks/2f3ohq_f1uov2.js?dpl=nogit-1791968216","/_next/static/chunks/0llqhg6-bxn_b.js?dpl=nogit-1791968216","/_next/static/chunks/2dx-vzwyw9a3g.js?dpl=nogit-1791968216","/_next/static/chunks/0qeo40bqomvxa.js?dpl=nogit-1791968216","/_next/static/chunks/1ku-vdy4ggo41.js?dpl=nogit-1791968216","/_next/static/chunks/1coblm1-go81_.js?dpl=nogit-1791968216","/_next/static/chunks/27ftpb6yvr6lz.js?dpl=nogit-1791968216","/_next/static/chunks/0k-y_4mcfub-p.js?dpl=nogit-1791968216","/_next/static/chunks/3zy87rvkige3i.js?dpl=nogit-1791968216","/_next/static/chunks/3it1o0ex-l5qz.js?dpl=nogit-1791968216","/_next/static/chunks/2gqripb6ybmw9.js?dpl=nogit-1791968216","/_next/static/chunks/2l63yczi1z2qz.js?dpl=nogit-1791968216","/_next/static/chunks/075i0tnxt4not.js?dpl=nogit-1791968216","/_next/static/chunks/1eyu-5752jh17.js?dpl=nogit-1791968216","/_next/static/chunks/1vka20opca5jn.js?dpl=nogit-1791968216","/_next/static/chunks/3f11o876enqgd.js?dpl=nogit-1791968216","/_next/static/chunks/13gj59kzq50t_.js?dpl=nogit-1791968216","/_next/static/chunks/1986062z5zb0v.js?dpl=nogit-1791968216","/_next/static/chunks/0uitbylhcd4am.js?dpl=nogit-1791968216","/_next/static/chunks/0wv8cpdr6cvhr.js?dpl=nogit-1791968216","/_next/static/chunks/06b61oz__qen3.js?dpl=nogit-1791968216","/_next/static/chunks/0a4x2f2g83l7b.js?dpl=nogit-1791968216","/_next/static/chunks/1lsxkfxy262n-.js?dpl=nogit-1791968216","/_next/static/chunks/3q5gc8lbwr4b4.js?dpl=nogit-1791968216","/_next/static/chunks/0dspbdeiizrn3.js?dpl=nogit-1791968216","/_next/static/chunks/2yss1g0cimuwe.js?dpl=nogit-1791968216","/_next/static/chunks/0e7v08pdxbxe2.js?dpl=nogit-1791968216","/_next/static/chunks/36nndwkz7iik3.js?dpl=nogit-1791968216","/_next/static/chunks/0zg1om_k0m5zv.js?dpl=nogit-1791968216","/_next/static/chunks/2fnth9-t6i7kd.js?dpl=nogit-1791968216","/_next/static/chunks/24srd-xd1m5z8.js?dpl=nogit-1791968216","/_next/static/chunks/0a57o9qvnv-nb.js?dpl=nogit-1791968216","/_next/static/chunks/41hx021qkamew.js?dpl=nogit-1791968216","/_next/static/chunks/1ksyn9m68446d.js?dpl=nogit-1791968216"],"RecordResourceResume"] 35:I[830476,["/_next/static/chunks/03tmy10hekekp.js?dpl=nogit-1791968216","/_next/static/chunks/2_6olli-sutu3.js?dpl=nogit-1791968216","/_next/static/chunks/1qp4g--o6-1vf.js?dpl=nogit-1791968216","/_next/static/chunks/0psy-n5us57a4.js?dpl=nogit-1791968216","/_next/static/chunks/3mz725-y91ph6.js?dpl=nogit-1791968216","/_next/static/chunks/2x_dbpl3b_l2r.js?dpl=nogit-1791968216","/_next/static/chunks/0nojijad0occ8.js?dpl=nogit-1791968216","/_next/static/chunks/19ua1o9n5v3ho.js?dpl=nogit-1791968216","/_next/static/chunks/0zkcxwtbsqliz.js?dpl=nogit-1791968216","/_next/static/chunks/3yfg2hrj9oxbd.js?dpl=nogit-1791968216","/_next/static/chunks/35s1d7gs3nyqk.js?dpl=nogit-1791968216","/_next/static/chunks/38w1x0vrld4-w.js?dpl=nogit-1791968216","/_next/static/chunks/3jpl-42mbad5n.js?dpl=nogit-1791968216","/_next/static/chunks/3kzt2piec6aoa.js?dpl=nogit-1791968216","/_next/static/chunks/2lsi6eli88uwt.js?dpl=nogit-1791968216","/_next/static/chunks/2os7nxouq91eq.js?dpl=nogit-1791968216","/_next/static/chunks/3ml3vooxhiupb.js?dpl=nogit-1791968216","/_next/static/chunks/04zr-wqafvwoa.js?dpl=nogit-1791968216","/_next/static/chunks/36r9y5g_s4k64.js?dpl=nogit-1791968216","/_next/static/chunks/40lyu17d590zu.js?dpl=nogit-1791968216","/_next/static/chunks/2g-t2n9ahs3tn.js?dpl=nogit-1791968216","/_next/static/chunks/2mv9l1xl_aa4j.js?dpl=nogit-1791968216","/_next/static/chunks/44w2c3xxfw4wd.js?dpl=nogit-1791968216","/_next/static/chunks/16jtsbm2g52s0.js?dpl=nogit-1791968216","/_next/static/chunks/05mo4k9k-ry1n.js?dpl=nogit-1791968216","/_next/static/chunks/0v4byuex1x38h.js?dpl=nogit-1791968216","/_next/static/chunks/2eanemqjnv2vr.js?dpl=nogit-1791968216","/_next/static/chunks/2f3ohq_f1uov2.js?dpl=nogit-1791968216","/_next/static/chunks/0llqhg6-bxn_b.js?dpl=nogit-1791968216","/_next/static/chunks/2dx-vzwyw9a3g.js?dpl=nogit-1791968216","/_next/static/chunks/0qeo40bqomvxa.js?dpl=nogit-1791968216","/_next/static/chunks/1ku-vdy4ggo41.js?dpl=nogit-1791968216","/_next/static/chunks/1coblm1-go81_.js?dpl=nogit-1791968216","/_next/static/chunks/27ftpb6yvr6lz.js?dpl=nogit-1791968216","/_next/static/chunks/0k-y_4mcfub-p.js?dpl=nogit-1791968216","/_next/static/chunks/3zy87rvkige3i.js?dpl=nogit-1791968216","/_next/static/chunks/3it1o0ex-l5qz.js?dpl=nogit-1791968216","/_next/static/chunks/2gqripb6ybmw9.js?dpl=nogit-1791968216","/_next/static/chunks/2l63yczi1z2qz.js?dpl=nogit-1791968216","/_next/static/chunks/075i0tnxt4not.js?dpl=nogit-1791968216","/_next/static/chunks/1eyu-5752jh17.js?dpl=nogit-1791968216","/_next/static/chunks/1vka20opca5jn.js?dpl=nogit-1791968216","/_next/static/chunks/3f11o876enqgd.js?dpl=nogit-1791968216","/_next/static/chunks/13gj59kzq50t_.js?dpl=nogit-1791968216","/_next/static/chunks/1986062z5zb0v.js?dpl=nogit-1791968216","/_next/static/chunks/0uitbylhcd4am.js?dpl=nogit-1791968216","/_next/static/chunks/0wv8cpdr6cvhr.js?dpl=nogit-1791968216","/_next/static/chunks/06b61oz__qen3.js?dpl=nogit-1791968216","/_next/static/chunks/0a4x2f2g83l7b.js?dpl=nogit-1791968216","/_next/static/chunks/1lsxkfxy262n-.js?dpl=nogit-1791968216","/_next/static/chunks/3q5gc8lbwr4b4.js?dpl=nogit-1791968216","/_next/static/chunks/0dspbdeiizrn3.js?dpl=nogit-1791968216","/_next/static/chunks/2yss1g0cimuwe.js?dpl=nogit-1791968216","/_next/static/chunks/0e7v08pdxbxe2.js?dpl=nogit-1791968216","/_next/static/chunks/36nndwkz7iik3.js?dpl=nogit-1791968216","/_next/static/chunks/0zg1om_k0m5zv.js?dpl=nogit-1791968216","/_next/static/chunks/2fnth9-t6i7kd.js?dpl=nogit-1791968216","/_next/static/chunks/24srd-xd1m5z8.js?dpl=nogit-1791968216","/_next/static/chunks/0a57o9qvnv-nb.js?dpl=nogit-1791968216","/_next/static/chunks/41hx021qkamew.js?dpl=nogit-1791968216","/_next/static/chunks/1ksyn9m68446d.js?dpl=nogit-1791968216"],"FlashcardAccessBranch"] 36:I[315438,["/_next/static/chunks/03tmy10hekekp.js?dpl=nogit-1791968216","/_next/static/chunks/2_6olli-sutu3.js?dpl=nogit-1791968216","/_next/static/chunks/1qp4g--o6-1vf.js?dpl=nogit-1791968216","/_next/static/chunks/0psy-n5us57a4.js?dpl=nogit-1791968216","/_next/static/chunks/3mz725-y91ph6.js?dpl=nogit-1791968216","/_next/static/chunks/2x_dbpl3b_l2r.js?dpl=nogit-1791968216","/_next/static/chunks/0nojijad0occ8.js?dpl=nogit-1791968216","/_next/static/chunks/19ua1o9n5v3ho.js?dpl=nogit-1791968216","/_next/static/chunks/0zkcxwtbsqliz.js?dpl=nogit-1791968216","/_next/static/chunks/3yfg2hrj9oxbd.js?dpl=nogit-1791968216","/_next/static/chunks/35s1d7gs3nyqk.js?dpl=nogit-1791968216","/_next/static/chunks/38w1x0vrld4-w.js?dpl=nogit-1791968216","/_next/static/chunks/3jpl-42mbad5n.js?dpl=nogit-1791968216","/_next/static/chunks/3kzt2piec6aoa.js?dpl=nogit-1791968216","/_next/static/chunks/2lsi6eli88uwt.js?dpl=nogit-1791968216","/_next/static/chunks/2os7nxouq91eq.js?dpl=nogit-1791968216","/_next/static/chunks/3ml3vooxhiupb.js?dpl=nogit-1791968216","/_next/static/chunks/04zr-wqafvwoa.js?dpl=nogit-1791968216","/_next/static/chunks/36r9y5g_s4k64.js?dpl=nogit-1791968216","/_next/static/chunks/40lyu17d590zu.js?dpl=nogit-1791968216","/_next/static/chunks/2g-t2n9ahs3tn.js?dpl=nogit-1791968216","/_next/static/chunks/2mv9l1xl_aa4j.js?dpl=nogit-1791968216","/_next/static/chunks/44w2c3xxfw4wd.js?dpl=nogit-1791968216","/_next/static/chunks/16jtsbm2g52s0.js?dpl=nogit-1791968216","/_next/static/chunks/05mo4k9k-ry1n.js?dpl=nogit-1791968216","/_next/static/chunks/0v4byuex1x38h.js?dpl=nogit-1791968216","/_next/static/chunks/2eanemqjnv2vr.js?dpl=nogit-1791968216","/_next/static/chunks/2f3ohq_f1uov2.js?dpl=nogit-1791968216","/_next/static/chunks/0llqhg6-bxn_b.js?dpl=nogit-1791968216","/_next/static/chunks/2dx-vzwyw9a3g.js?dpl=nogit-1791968216","/_next/static/chunks/0qeo40bqomvxa.js?dpl=nogit-1791968216","/_next/static/chunks/1ku-vdy4ggo41.js?dpl=nogit-1791968216","/_next/static/chunks/1coblm1-go81_.js?dpl=nogit-1791968216","/_next/static/chunks/27ftpb6yvr6lz.js?dpl=nogit-1791968216","/_next/static/chunks/0k-y_4mcfub-p.js?dpl=nogit-1791968216","/_next/static/chunks/3zy87rvkige3i.js?dpl=nogit-1791968216","/_next/static/chunks/3it1o0ex-l5qz.js?dpl=nogit-1791968216","/_next/static/chunks/2gqripb6ybmw9.js?dpl=nogit-1791968216","/_next/static/chunks/2l63yczi1z2qz.js?dpl=nogit-1791968216","/_next/static/chunks/075i0tnxt4not.js?dpl=nogit-1791968216","/_next/static/chunks/1eyu-5752jh17.js?dpl=nogit-1791968216","/_next/static/chunks/1vka20opca5jn.js?dpl=nogit-1791968216","/_next/static/chunks/3f11o876enqgd.js?dpl=nogit-1791968216","/_next/static/chunks/13gj59kzq50t_.js?dpl=nogit-1791968216","/_next/static/chunks/1986062z5zb0v.js?dpl=nogit-1791968216","/_next/static/chunks/0uitbylhcd4am.js?dpl=nogit-1791968216","/_next/static/chunks/0wv8cpdr6cvhr.js?dpl=nogit-1791968216","/_next/static/chunks/06b61oz__qen3.js?dpl=nogit-1791968216","/_next/static/chunks/0a4x2f2g83l7b.js?dpl=nogit-1791968216","/_next/static/chunks/1lsxkfxy262n-.js?dpl=nogit-1791968216","/_next/static/chunks/3q5gc8lbwr4b4.js?dpl=nogit-1791968216","/_next/static/chunks/0dspbdeiizrn3.js?dpl=nogit-1791968216","/_next/static/chunks/2yss1g0cimuwe.js?dpl=nogit-1791968216","/_next/static/chunks/0e7v08pdxbxe2.js?dpl=nogit-1791968216","/_next/static/chunks/36nndwkz7iik3.js?dpl=nogit-1791968216","/_next/static/chunks/0zg1om_k0m5zv.js?dpl=nogit-1791968216","/_next/static/chunks/2fnth9-t6i7kd.js?dpl=nogit-1791968216","/_next/static/chunks/24srd-xd1m5z8.js?dpl=nogit-1791968216","/_next/static/chunks/0a57o9qvnv-nb.js?dpl=nogit-1791968216","/_next/static/chunks/41hx021qkamew.js?dpl=nogit-1791968216","/_next/static/chunks/1ksyn9m68446d.js?dpl=nogit-1791968216"],"TopicFlashcardRunner"] 23:[["$","$L32",null,{"feature":"flashcards"}],"$L33",["$","$L34",null,{"href":"/gcse/physics/edexcel/efficiency/flashcards","label":"3.2.3 Efficiency","subjectCode":"gcse_physics","surface":"flashcards"}],["$","$L35",null,{"runner":["$","div",null,{"className":"min-h-0 flex-1 overflow-hidden bg-background","children":["$","$L36",null,{"decks":[{"id":"269a39d5-c270-4e18-bfbc-f69d5fe1b5c5","title":"1.2.2 Efficiency Flashcards","topicId":"bb1831c1-c827-45e4-9a16-68aede7f9cd8","topicSlug":"efficiency","cards":[{"id":"6ce0b4ea-8a5a-42c1-9990-de3ddfd8b96a","cardType":"basic","points":1,"front":"What does the efficiency of a device indicate?","back":"How much of the input energy is transferred usefully.","mcqOptions":null},{"id":"2ffdedf0-ff0d-422d-97b5-68a72f86106e","cardType":"basic","points":1,"front":"What is the efficiency equation using energy?","back":"$$\\text{efficiency} = \\frac{\\text{useful output energy transfer}}{\\text{total input energy transfer}}$","mcqOptions":null},{"id":"a8bc1264-0947-4f82-a5a1-ddc54527d24e","cardType":"basic","points":1,"front":"Which energy transfer goes on top of the efficiency fraction?","back":"The useful output energy transfer.","mcqOptions":[{"text":"The useful output energy transfer.","correct":true,"explanation":"The useful output belongs on top because efficiency measures the fraction of the input energy that reaches the intended useful output."},{"text":"The total input energy transfer.","correct":false,"explanation":"Putting total input on top reverses the efficiency fraction. Total input belongs underneath because it is the complete amount supplied to the device."},{"text":"The wasted energy transfer.","correct":false,"explanation":"Wasted energy indicates dissipation and is not the desired numerator. Useful output energy transfer goes on top when calculating efficiency."},{"text":"The unwanted heating energy transfer.","correct":false,"explanation":"Unwanted heating is usually a loss, so placing it above the fraction would measure wasted energy rather than the device’s useful efficiency."}]},{"id":"1f059647-d802-4369-babd-c207d48a9fb4","cardType":"basic","points":1,"front":"Why must the input and output energy values use the same unit?","back":"To make the efficiency ratio valid.","mcqOptions":null},{"id":"39293e83-035f-4f33-8352-0c15f607a84d","cardType":"basic","points":1,"front":"A device transfers $60\\ \\text{J}$ usefully from a $100\\ \\text{J}$ input. What is its efficiency?","back":"$$0.60$, or $60\\%$.","mcqOptions":null},{"id":"b3deda6b-c6b2-4977-a4a3-be1d2dc86409","cardType":"basic","points":1,"front":"A motor has a $500\\ \\text{J}$ input and a $125\\ \\text{J}$ useful output. What is its efficiency?","back":"$$\\frac{125}{500} = 0.25$, or $25\\%$.","mcqOptions":null},{"id":"f2c2d277-3c04-4a37-a0f2-45cf75e33a4b","cardType":"basic","points":1,"front":"What is the efficiency equation using power?","back":"$$\\text{efficiency} = \\frac{\\text{useful power output}}{\\text{total power input}}$","mcqOptions":null},{"id":"bf44a27f-e957-4a84-b9d4-0dd45a4c303e","cardType":"basic","points":1,"front":"What unit should both powers have when calculating efficiency?","back":"Watts, $\\text{W}$.","mcqOptions":null},{"id":"334232ff-8868-4b4d-94f6-d558169bab27","cardType":"basic","points":1,"front":"A lamp has a $40\\ \\text{W}$ input and an $8\\ \\text{W}$ useful light output. What is its efficiency?","back":"$$\\frac{8}{40} = 0.20$, or $20\\%$.","mcqOptions":null},{"id":"5c29eeb8-3005-419e-bdef-868edb7141fd","cardType":"basic","points":1,"front":"How do you convert a decimal efficiency into a percentage?","back":"Multiply by $100$ and add the percentage sign.","mcqOptions":null},{"id":"55a61449-caa5-4c64-96f0-c8b991788c5a","cardType":"basic","points":1,"front":"How do you convert a percentage efficiency into a decimal?","back":"Divide by $100$.","mcqOptions":null},{"id":"d3167ffe-b627-49aa-bf91-6ff0575f22cb","cardType":"basic","points":1,"front":"What is the usual range of a decimal efficiency?","back":"Between $0$ and $1$.","mcqOptions":null},{"id":"9826e9ae-cd52-4b8c-830b-a7b1a1728d0c","cardType":"basic","points":1,"front":"What is the usual range of a percentage efficiency?","back":"Between $0\\%$ and $100\\%$.","mcqOptions":null},{"id":"be736d9b-39a0-4dd5-aa92-b438f8c837cc","cardType":"basic","points":2,"front":"Why can no device be perfectly efficient?","back":"Some energy is always transferred to unwanted stores, often heating the surroundings.","mcqOptions":[{"text":"Some energy is always transferred to unwanted stores, often heating the surroundings.","correct":true,"explanation":"Real devices always dissipate some energy through effects such as friction, electrical resistance, or air resistance, so not all input reaches the useful output."},{"text":"Some energy is always transferred to useful stores, often cooling the surroundings.","correct":false,"explanation":"Useful transfers do not explain energy loss, and devices cannot usually cool all surroundings without an energy transfer mechanism. Unwanted stores cause inefficiency."},{"text":"No energy is ever transferred to unwanted stores, because energy is conserved.","correct":false,"explanation":"Energy conservation means energy is not destroyed, but it can spread into unwanted stores. That dissipation prevents real devices from reaching perfect efficiency."},{"text":"All energy is always transferred to unwanted stores, often heating the surroundings.","correct":false,"explanation":"Real devices transfer some energy usefully as well as dissipating some unwanted energy. Perfect inefficiency would mean no useful output at all."}]},{"id":"558e0e03-0aa3-4a0c-a14e-89ee2b1f7a93","cardType":"basic","points":2,"front":"What happens to the useful output when a transfer becomes more efficient?","back":"A greater proportion of the input energy goes to the intended useful output.","mcqOptions":null},{"id":"e9f9ab55-d15d-4119-bdf0-1f490516074d","cardType":"basic","points":2,"front":"How does lubrication increase the efficiency of moving parts?","back":"

Lubrication reduces friction.
Less energy is dissipated by heating, so more is transferred usefully.

","mcqOptions":null},{"id":"de1dea27-ff8a-406c-b90a-57f67beae7c7","cardType":"basic","points":2,"front":"How does thermal insulation increase efficiency when heating is the intended transfer?","back":"

It reduces unwanted thermal transfer to the surroundings.
More energy remains available for the useful heating transfer.

","mcqOptions":null},{"id":"8f5ea055-c429-49ff-9709-e8b1697f69e3","cardType":"basic","points":2,"front":"How does streamlining a vehicle increase its efficiency?","back":"It reduces air resistance, so less engine energy is wasted and more maintains the vehicle's kinetic store.","mcqOptions":null},{"id":"2a3e7bcc-3a58-4e8e-b82f-f24cbf32abb7","cardType":"basic","points":2,"front":"How can reducing electrical resistance improve the efficiency of an electrical device?","back":"Less energy is wasted heating the wires, so more reaches the useful output.","mcqOptions":null},{"id":"464e5c01-dbd5-4562-9d79-1e5d8b593fb3","cardType":"cloze","points":null,"front":"Efficiency is the proportion of the total input energy transfer that is [ ].","back":"Efficiency is the proportion of the total input energy transfer that is usefully transferred.","mcqOptions":null},{"id":"fa0e48b4-8be2-4de2-ab77-05e19150ab67","cardType":"cloze","points":null,"front":"Friction transfers energy by heating the thermal stores of the parts and [ ].","back":"Friction transfers energy by heating the thermal stores of the parts and surroundings.","mcqOptions":null},{"id":"0060780e-dfc8-4184-bf34-5a22821e0128","cardType":"cloze","points":null,"front":"To increase efficiency, reduce [ ].","back":"To increase efficiency, reduce unwanted energy transfers.","mcqOptions":null},{"id":"f318b5d0-b4c2-43ff-bec7-085d1ca0a54f","cardType":"cloze","points":null,"front":"Energy is not destroyed in an inefficient transfer; it is [ ] to the surroundings.","back":"Energy is not destroyed in an inefficient transfer; it is dissipated to the surroundings.","mcqOptions":null},{"id":"0a6986e6-db14-4497-8a06-663745dcd5af","cardType":"cloze","points":null,"front":"A decimal efficiency of $0.72$ is equal to $\\text{[...]}$.","back":"A decimal efficiency of $0.72$ is equal to $\\boxed{72\\%}$.","mcqOptions":null}]}],"examCountdown":{"examDate":"2027-05-25","paperLabel":"Paper 1"},"heading":"3.2.3 Efficiency","title":"1.2.2 Efficiency Flashcards","topbar":{"backHref":"/gcse/physics/edexcel/flashcards"},"topicSidebar":"$L37"}]}],"topicId":"bb1831c1-c827-45e4-9a16-68aede7f9cd8","walled":"$L38"}],"$L39","$L3a"]

3.2.3 Efficiency Flashcards

3.2.3 Efficiency Flashcards