Practice Transformer in Physics
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A device that changes AC voltage using electromagnetic induction between two coils on a shared iron core.
A transformer trades voltage for current (or vice versa) — like a gear system trades speed for torque.
Showing a random 20 of 50 problems.
Example 1
mediumWhy does a transformer hum and warm up even with no load connected?
Example 2
easyA step-up transformer has turns on the primary coil and turns on the secondary coil. If the input voltage is , what is the output voltage?
Example 3
easyTrue or false: an ideal transformer can amplify electrical power.
Example 4
easyWhy does the National Grid use very high voltages to transmit electricity?
Example 5
mediumAn ideal transformer supplies at on the secondary. If the primary voltage is , find the primary current.
Example 6
mediumAn ideal transformer: V, A, V. Find .
Example 7
challengeA transmission line of resistance delivers . Compare wire-loss percentage at vs delivery.
Example 8
mediumA transformer should output V from V with turns. Find .
Example 9
easyWhich physical law forms the underlying principle of a transformer's operation?
Example 10
mediumA transformer steps V down to V. If the secondary draws A, find the primary current (ideal).
Example 11
mediumA transformer: , , V. Find and identify the type.
Example 12
mediumA phone charger transformer converts AC to AC. If the primary coil has turns, how many turns does the secondary coil have?
Example 13
easyIn an ideal transformer, what quantity is conserved between primary and secondary?
Example 14
easyA transformer has a turns ratio (secondary : primary) of and . Find .
Example 15
challengeA transformer is efficient. The primary draws W. Find the output power and, if V, the secondary current.
Example 16
mediumAn ideal transformer: V, A, V. Find .
Example 17
hardA transformer is efficient. The primary draws at . Find the secondary power output.
Example 18
easyA transformer with more primary turns than secondary turns is which type?
Example 19
challengeA transformer has , . The secondary feeds a resistor. If V (ideal), find the secondary current and the power delivered.
Example 20
mediumA bell circuit uses a transformer that steps down to to drive a bell. Find the primary current (assume ideal).