Question

When a current of 2.0A flows in the 100-turn primary of an ideal transformer, this causes 14 A to flow in the secondary. How many turns are in the secondary?A) 700B) 356C) 114D) 14E) 4

Answer 1

Answer: The correct option is D) 14

Step-by-step explanation:

A transformer is a device used for stepping- up or stepping- down an alternating voltage. It has both primary and secondary windings. Energy is usually supplied through the primary coil and delivered through the secondary coil in a transformer. Using the equation:

Ns= lp

Np= Is

Where Ns--> number of turns in secondary coil

Np--> number of turns in primary coil

Is--> current flow in secondary coil

Ip--> current flow in primary coil.

Therefore Ns= Np Ip/Is

Substituting from the question

Ns= 100×2/14

Ns= 200/14

Ns = 14.28 which is approximately 14 turns in the secondary coil.