A step-up transformer in a transmitter substation is used to increase an alternating voltage from 110 V to 2.20 kV2.20\text{ kV}2.20 kV. The transformer has an efficiency of 88.0%. Under normal operating conditions, the current in the secondary coil is 0.150 A.
What is the current in the primary coil?
2.64 A2.64\text{ A}2.64 A
3.00 A3.00\text{ A}3.00 A
3.41 A3.41\text{ A}3.41 A
3.87 A3.87\text{ A}3.87 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.