IGCSE Physics (0625) 4.2.3 Electromotive force and potential difference- Paper 1-2023,2024 and 2025

Question

A lamp is to be connected in a circuit so that the potential difference (p.d.) across it can be varied from 0 to 6 V.

Which circuit would be most suitable?

                     

Answer/Explanation

Ans: B

Question

The diagram shows two voltmeters P and Q connected to a potential divider.

                 

The sliding connection at point X is moved towards the top of the diagram.

What happens to the reading on P and to the reading on Q?

 

reading on P

reading on Q

A

decreases

decreases

B

decreases

increases

C

increases

decreases

D

increases

increases

Answer/Explanation

Ans: B

We know that  
Since both the resistance is connected in series so, the current in both the resistance is same .
So,   
 On reducing resistance of P , the reading across P decreases.
And since overall current increases , so reading across Q increases.
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