A transformer is 100% efficient. The primary potential difference is 230 V and the primary current is 120 mA. The secondary potential difference is 6.0 V.
What is the secondary current?
0.0046 A0.0046\ \mathrm{A}0.0046 A
0.72 A0.72\ \mathrm{A}0.72 A
4600 A4600\ \mathrm{A}4600 A
4.6 A4.6\ \mathrm{A}4.6 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.