CAIE IGCSE Physics 4.5.6.6 Principle of Operation of a Simple Questions

Learn how alternating current in the primary creates changing flux and an induced secondary voltage.

Exam points

explain transformer operation through changing magnetic flux in a soft-iron core
state why the primary supply must be alternating to induce a secondary voltage
describe how mutual induction transfers an alternating voltage between coils

[Maximum number: 3]

Fig. 9.1 shows a mobile phone (cell phone) being charged on a wireless charging plate.

Fig. 9.1

When the charging plate is switched on, there is an alternating current (a.c.) in the primary coil. A secondary coil is in the mobile phone.

Explain how a current is produced in the secondary coil.

All question bank results loaded

CAIE IGCSE Physics 4.5.6.6 Principle of Operation of a Simple Questions question 1