A transformer in a small theatre is 100% efficient. During a performance, 72 kJ of energy is supplied to its primary coil over 3.0 minutes. The potential difference across the secondary coil is 20 V.
What is the current in the secondary coil?
0.020 A0.020\ \mathrm{A}0.020 A
20 A20\ \mathrm{A}20 A
1200 A1200\ \mathrm{A}1200 A
1.2 A1.2\ \mathrm{A}1.2 A
108 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid, covering 13.2.1 Transformers and induction, 13.2.2 The transformer turns-ratio equation, 13.2.3 The National Grid, 13.2.4 The transformer power equation, and 13.2.5 Advantages of high-voltage transmission. Each one has a worked solution and a mark scheme showing where the marks go.