The primary voltage supplied to a transformer is 6.0 V. The secondary voltage is 15.0 V and the secondary current is 1.2 A. The transformer is 100% efficient.
What is the primary current in the transformer?
0.48 A0.48\text{ A}0.48 A
1.2 A1.2\text{ A}1.2 A
3.0 A3.0\text{ A}3.0 A
7.5 A7.5\text{ A}7.5 A
136 exam-style questions on CIE IGCSE Physics 4.5.6a Construction and operation of a transformer. Each one has a worked solution and a mark scheme showing where the marks go.