An industrial step-down transformer is used to supply power to a heavy-duty electric arc welder. The primary winding of the transformer has 1200 turns, and the secondary winding has 150 turns.
An alternating root mean square (rms) voltage of 480 V is applied across the primary winding, resulting in an primary rms current of 15.0 A. Under these operating conditions, the transformer has an efficiency of 85%.
What are the rms values of the secondary voltage and the secondary current?
Secondary voltage: 60 V60\text{ V}60 V; Secondary current: 102 A102\text{ A}102 A
Secondary voltage: 60 V60\text{ V}60 V; Secondary current: 120 A120\text{ A}120 A
Secondary voltage: 3840 V3840\text{ V}3840 V; Secondary current: 1.6 A1.6\text{ A}1.6 A
Secondary voltage: 60 V60\text{ V}60 V; Secondary current: 12.8 A12.8\text{ A}12.8 A
66 exam-style questions on AQA A Level Physics Magnetic fields (A-level only), covering Magnetic flux density (A-level only), Moving charges in a magnetic field (A-level only), Magnetic flux and flux linkage (A-level only), Electromagnetic induction (A-level only), Alternating currents (A-level only), and The operation of a transformer (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.