iGCSE Physics (0625) 4.5.6 The transformer Paper 2-2023,2024&2025

Question

The diagram shows a transformer.

                                                       

What is the output voltage?

A 0.35 V

B 2.9 V

C 4600 V

D 105 000 V

Answer/Explanation

Ans: C

Question

The diagram shows a simple transformer with an input of 240 V and an output of 40 V.

There are 600 turns on the primary coil.

                                     

How many turns are there on the secondary coil?

A 100

B 320

C 400

D 3600

Answer/Explanation

Ans: A

Question

Power losses in transmission cables are reduced by increasing the transmission voltage.

What is the explanation for this reduction?

A. The current decreases, reducing thermal energy losses.

B. The current increases, increasing the flow of charge.

C. The resistance of the cable increases, reducing the current.

D. The resistance of the cable decreases.

Answer/Explanation

Ans: A

Question

The diagram shows a mains transformer that has an output voltage of 12 V.

             

How many turns of wire are in the secondary coil?

A 12

B 20

C 50

D 20 000

Answer/Explanation

Ans: C

Question

An input voltage of 10 V is supplied to the primary coil of a transformer. An output voltage of 40 V

is produced across the secondary coil.

The 10 V supply at the primary coil is now replaced with a 40 V supply.

What is the new output voltage across the secondary coil?

A 10 V

B 40 V

C 70 V

D 160 V

Answer/Explanation

Ans: D

Scroll to Top