Physics 2015 JAMB Past Questions - Question 1: A transformer is rated 240 V. If the primary coil is 4000 turns and the secondary voltage 12 V, determine the number of turns in the secondary coil

Correct Answer

D

Explanation

To determine the number of turns in the secondary coil of the transformer, we can use the turns ratio formula:

Turns ratio = (Number of turns in secondary coil) / (Number of turns in primary coil)

Given that the primary coil has 4000 turns and the secondary voltage is 12 V, and the transformer is rated at 240 V, we can set up the equation as follows:

240 V / 12 V = 4000 turns / (Number of turns in secondary coil)

Simplifying the equation, we have:

20 = 4000 / (Number of turns in secondary coil)

To find the number of turns in the secondary coil, we can rearrange the equation:

(Number of turns in secondary coil) = 4000 / 20

(Number of turns in secondary coil) = 200

Therefore, the number of turns in the secondary coil is 200.