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During use, a vibration causes the live wire inside the lawnmower to come loose and contact the metal chassis.","difficulty":4,"difficultyBand":"medium","tier":null,"totalMarks":2,"sourceTitle":null,"calculatorUse":null,"isCalculation":false,"parts":[{"id":"81346f29-8711-4a78-b91a-bb393fe94f60","label":null,"content":"Explain how the earth wire protects the user from receiving a fatal electric shock in this scenario.","markscheme":"- The earth wire provides a safe, low-resistance path to the ground, meaning current flows through it rather than through the user if they touch the metal chassis M1\n- This high current flow quickly melts (blows) the fuse, breaking the circuit and isolating the live electrical supply A1","marks":2,"order":0,"markingRubric":null,"tableImages":[],"explanation":{"methods":[{"id":"earth_fault_protection","label":"Earth fault protection","steps":[{"type":"text","order":0,"title":"Identify the fault","content":"The loose **live wire** has touched the metal chassis, so the chassis could become live. A person touching it could otherwise provide a path for current through their body.","highlights":[{"text":"the live wire inside the lawnmower to come loose and contact the metal chassis","location":"specification"}]},{"type":"drawing","order":1,"title":"See the fault route","width":880,"height":418,"shapes":[{"id":"seg-LF1","toX":273.3,"toY":112.6,"type":"arrow","color":"red","fromX":166.6,"fromY":112.6},{"id":"seg-F2W1","type":"line","color":"red","points":[{"x":347.9,"y":112.6},{"x":422.6,"y":112.6}]},{"id":"seg-W1W2","type":"line","color":"red","points":[{"x":422.6,"y":112.6},{"x":422.6,"y":181.9}]},{"id":"seg-W2C","type":"line","color":"red","points":[{"x":422.6,"y":181.9},{"x":422.6,"y":192.6}]},{"id":"poly-1","type":"line","color":"black","points":[{"x":358.6,"y":192.6},{"x":571.9,"y":192.6},{"x":571.9,"y":325.9},{"x":358.6,"y":325.9},{"x":358.6,"y":192.6}]},{"h":8,"w":8,"x":418.6,"y":188.6,"id":"pt-C","geo":"ellipse","fill":"solid","type":"geo","color":"red"},{"id":"seg-CE1","toX":571.9,"toY":259.3,"type":"arrow","color":"blue","fromX":422.6,"fromY":192.6},{"id":"seg-E1E2","toX":657.3,"toY":259.3,"type":"arrow","color":"blue","fromX":571.9,"fromY":259.3},{"id":"seg-E2G","toX":726.6,"toY":259.3,"type":"arrow","color":"blue","fromX":657.3,"fromY":259.3},{"id":"seg-F1F2","type":"line","color":"black","points":[{"x":273.3,"y":112.6},{"x":347.9,"y":112.6}]},{"id":"pt-C-label-leader","type":"line","color":"grey","points":[{"x":480.2,"y":135},{"x":429.7,"y":185.5}]},{"x":430.4,"y":106,"id":"pt-C-label","size":"s","text":"Contact point","type":"text","color":"red"},{"x":576.9,"y":217.3,"id":"seg-E1E2-label","text":"Earth wire","type":"text","color":"blue"},{"x":42,"y":42,"id":"pt-L-label","text":"Live supply","type":"text"},{"x":281.6,"y":70.6,"id":"seg-F1F2-label","text":"Fuse","type":"text","color":"black"},{"id":"pt-W2-label-leader","type":"line","color":"grey","points":[{"x":351.8,"y":181.9},{"x":412.6,"y":181.9}]},{"x":201.1,"y":169.4,"id":"pt-W2-label","size":"s","text":"Loose live wire","type":"text"},{"x":741.6,"y":242.8,"id":"pt-G-label","text":"Ground","type":"text"},{"id":"pt-ChassisLabel-label-leader","type":"line","color":"grey","points":[{"x":422.5,"y":339.4},{"x":458.2,"y":303.7}]},{"x":313.1,"y":343.4,"id":"pt-ChassisLabel-label","text":"Metal chassis","type":"text"}],"caption":"The loose live wire touches the metal chassis. The blue arrows show the fault-current route from the chassis through the earth wire to ground.","diagramSpec":{"points":[{"at":[0,4],"name":"L"},{"at":[2,4],"name":"F1"},{"at":[3.4,4],"name":"F2"},{"at":[4.8,4],"name":"W1"},{"at":[4.8,2.7],"name":"W2"},{"at":[4.8,2.5],"name":"C"},{"at":[3.6,2.5],"name":"TL"},{"at":[7.6,2.5],"name":"TR"},{"at":[7.6,0],"name":"BR"},{"at":[3.6,0],"name":"BL"},{"at":[7.6,1.25],"name":"E1"},{"at":[9.2,1.25],"name":"E2"},{"at":[10.5,1.25],"name":"G"},{"at":[5.6,0.55],"name":"ChassisLabel"}],"elements":[{"to":"F1","from":"L","kind":"segment","color":"red","arrows":"end"},{"to":"W1","from":"F2","kind":"segment","color":"red"},{"to":"W2","from":"W1","kind":"segment","color":"red"},{"to":"C","from":"W2","kind":"segment","color":"red"},{"kind":"polygon","color":"black","points":["TL","TR","BR","BL"]},{"at":"C","kind":"point","color":"red","label":"Contact point","labelDir":"above-right"},{"to":"E1","from":"C","kind":"segment","color":"blue","arrows":"end"},{"to":"E2","from":"E1","kind":"segment","color":"blue","label":"Earth wire","arrows":"end"},{"to":"G","from":"E2","kind":"segment","color":"blue","arrows":"end"},{"at":"L","kind":"point","label":"Live supply","style":"none","labelDir":"above-left"},{"to":"F2","from":"F1","kind":"segment","color":"black","label":"Fuse"},{"at":"W2","kind":"point","label":"Loose live wire","style":"none","labelDir":"right"},{"at":"G","kind":"point","label":"Ground","style":"none","labelDir":"right"},{"at":"ChassisLabel","kind":"point","label":"Metal chassis","style":"none","labelDir":"above"}]}},{"type":"text","order":2,"title":"Use the earth wire","content":"The earth wire gives the current a safe, **low-resistance** path to ground. This means that, if the user touches the chassis, the current flows through the earth wire rather than through the user. **This earns M1.**","highlights":[{"text":"earth wire protects the user","location":"specification"}]},{"type":"text","order":3,"title":"Blow the fuse","content":"Because the earth path has low resistance, a large current flows. This quickly melts the fuse, which breaks the circuit and isolates the live supply. **This earns A1.**","highlights":[{"text":"fatal electric shock","location":"specification"}]}]}],"generatedAt":"2026-07-21T18:27:43.685Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null,"walkthroughVideo":null},{"id":"6b23c261-a0df-4760-84e7-d3cbef214294","revisionId":"a530e83d-90d8-4ae1-9ec0-7a5090467d03","questionNumber":null,"questionType":"LA","specification":"","difficulty":5,"difficultyBand":"medium","tier":null,"totalMarks":2,"sourceTitle":null,"calculatorUse":null,"isCalculation":false,"parts":[{"id":"ab773d27-3bfd-4aa7-b2b2-32dc5d2c93d2","label":null,"content":"Explain why the copper wires inside the cable supplying a high-power electric cooker must be much thicker than the copper wires inside the cable of a bedside table lamp.","markscheme":"- Explains that the electric cooker operates at a higher power rating and thus draws a significantly larger current than the bedside table lamp B1\n- Explains that thicker wires have a lower electrical resistance, which reduces the rate of thermal energy dissipation ($P = I^2R$), preventing the cable from overheating or melting its insulation B1","marks":2,"order":0,"markingRubric":null,"tableImages":[],"explanation":{"methods":[{"id":"power_and_resistance","label":"Compare power and resistance","steps":[{"type":"text","order":0,"title":"Compare the current","content":"The cooker has a much higher power rating than the bedside table lamp. Because both use the mains supply, the cooker draws a much larger current. **This earns B1**: link the cooker’s higher power to its larger current.","highlights":[{"text":"high-power electric cooker","location":"specification"},{"text":"bedside table lamp","location":"specification"}]},{"type":"text","order":1,"title":"Explain the thicker wire","content":"A thicker copper wire has a lower resistance. The heating rate is $P_{\\mathrm{heating}}=I^2R$, so lowering $R$ reduces the thermal energy dissipated in the cable and helps prevent it overheating or melting its insulation. **This earns B1**.","highlights":[{"text":"must be much thicker","location":"specification"}]}]}],"generatedAt":"2026-07-22T12:10:59.449Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null,"walkthroughVideo":null},{"id":"a98ec5e0-3361-493c-ba8b-ac786e2d6ef0","revisionId":"d7b3e823-9226-483c-946e-ddc154c68967","questionNumber":null,"questionType":"LA","specification":"A household instantaneous electric shower has a power rating of $9.6\\text{ kW}$, whereas an LED desk lamp has a power rating of $8\\text{ W}$.","difficulty":6,"difficultyBand":"medium","tier":null,"totalMarks":2,"sourceTitle":null,"calculatorUse":null,"isCalculation":false,"parts":[{"id":"3903bfd2-4179-4d8b-8825-a94fe5a24440","label":null,"content":"Explain why the copper conductors in the dedicated cable supplying the electric shower must have a significantly larger cross-sectional area than the copper conductors in the flexible cable of the desk lamp.","markscheme":"- Identifies that the electric shower draws a much larger electrical current than the desk lamp due to its much higher power rating. M1\n- Explains that conductors with a larger cross-sectional area have a lower electrical resistance, which reduces the rate of heating ($P = I^2R$) and prevents the cable from overheating, melting its insulation, or causing a fire. A1","marks":2,"order":0,"markingRubric":null,"tableImages":[],"explanation":{"methods":[{"id":"current_and_heating","label":"Compare current and heating","steps":[{"type":"text","order":0,"title":"Compare the power ratings","content":"First convert the shower rating into watts so both appliances use the same unit:\n\n$$9.6\\text{ kW}=9600\\text{ W}$$\n\nThe shower's power rating is $1200$ times the lamp's. At the same mains potential difference, the relationship $P=IV$ means the shower must draw a much larger current. **This comparison earns M1.**","highlights":[{"text":"power rating of $9.6\\text{ kW}$","location":"specification"},{"text":"power rating of $8\\text{ W}$","location":"specification"}]},{"type":"hyper_latex","block":{"nodes":[{"latex":"P_{\\mathrm{heating}}=I^2R"},{"latex":"I_{\\mathrm{shower}}\\text{ is large, so }\\htmlData{anchor=heating-risk}{I_{\\mathrm{shower}}^2R}\\text{ could be large}"},{"latex":"\\text{larger cross-sectional area}\\quad\\Longrightarrow\\quad\\htmlData{anchor=lower-resistance}{R\\text{ is lower}}"},{"latex":"R\\text{ lower}\\quad\\Longrightarrow\\quad P_{\\mathrm{heating}}\\text{ is reduced}"}],"highlights":[{"color":"red","style":"box","anchor":"heating-risk"},{"color":"sky","anchor":"lower-resistance"}]},"order":3,"title":"Prevent cable heating","description":"Electrical energy transferred by the cable’s resistance becomes thermal energy; P equals I squared R gives the rate of this heating. Reducing resistance is especially important when the current is large. A larger cross-sectional area gives lower resistance, reducing heating and helping prevent overheating, melted insulation or fire. This earns A1."}]}],"generatedAt":"2026-07-22T11:35:35.911Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null,"walkthroughVideo":null}],"subjectCode":"gcse_physics","summaries":[{"id":"00775923-7e82-4a0e-b43b-ac165f762f0c","difficultyBand":"easy","calculatorUse":null,"totalMarks":1,"questionType":"MC","isCalculation":true},{"id":"3ab1b18d-5181-41ab-bdd2-41b5802ac5e3","difficultyBand":"easy","calculatorUse":null,"totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"3fb30f92-7bcf-42fe-a26d-a8b15711bc7f","difficultyBand":"easy","calculatorUse":null,"totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"53aca2ba-ee3d-46a4-baca-1b110c213a59","difficultyBand":"medium","calculatorUse":null,"totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"65366aef-f5a2-4167-8c22-c346f00a54eb","difficultyBand":"easy","calculatorUse":null,"totalMarks":1,"questionType":"MC","isCalculation":false},{"id":"6b23c261-a0df-4760-84e7-d3cbef214294","difficultyBand":"medium","calculatorUse":null,"totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"a98ec5e0-3361-493c-ba8b-ac786e2d6ef0","difficultyBand":"medium","calculatorUse":null,"totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"b8a481ea-0dd2-44ac-8720-aab434feb54a","difficultyBand":"easy","calculatorUse":null,"totalMarks":1,"questionType":"MC","isCalculation":true},{"id":"d60f5025-5f1e-4dd5-b903-25f30e9b45ac","difficultyBand":"easy","calculatorUse":null,"totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"e8f326a5-383e-480e-863d-60a03ee1b81e","difficultyBand":"medium","calculatorUse":null,"totalMarks":1,"questionType":"MC","isCalculation":true}],"title":"10.4 Mains electricity","topicId":"ca594dae-1c93-59e9-a97e-6c8daa38c6f8","topicSidebar":"$L3c","topicSlug":"mains-electricity-and-safety","topicTitle":"10.4 Mains electricity"}]}],"$L3d","$L3e"]}]

10.4 Mains electricity

Question 2

10.4 Mains electricity Questions

10.4 Mains electricity

Question 2

10.4 Mains electricity Questions