PHYSICS
JAMB 2022 - Question 19
Physics 2022 JAMB Past Questions - Question 19: A transformer connected to a 240V a.c, source has 500 turns in its primary winding and 25 turns in its secondary winding. Calculate the e.m.f induced in the secondary winding
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
B
Explanation
To calculate the electromotive force (e.m.f) induced in the secondary winding of the transformer, you can use the formula:
E_secondary = (N_secondary / N_primary) * E_primary
Where:
E_secondary = e.m.f induced in the secondary winding
N_secondary = number of turns in the secondary winding
N_primary = number of turns in the primary winding
E_primary = voltage of the AC power source
In this case:
N_secondary = 25
N_primary = 500
E_primary = 240V
Plugging these values into the formula:
E_secondary = (25 / 500) * 240V
E_secondary = (1/20) * 240V
E_secondary = 12V
Therefore, the e.m.f induced in the secondary winding is 12V.
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