Question

Which Statements is / are correct ?

A. An ammeter is connected in series in a circuit and a voltmeter is connected in Parallel.

B. An ammeter has a high resistance

C. A voltmeter has a low resistance

1. A, B and C
2. A, B
3. B, C
4. A

Answer 1

Correct Answer - Option 4 : A

Concept:

Ammeter:

•  It is a device used to measure the current in a circuit.
• It is generally connected in series in a circuit. 
• This is because the current remains the same when devices are connected in series. 
• The ideal ammeter has low resistance because the reading will change as an extra resistance is added in series. 

Voltmeter: 

• It is a device used for measuring the electric potential difference between two points in an electric circuit.
• It is connected in parallel across the two points to measure the voltage drop between the points.
• This is because the potential difference remains the same if devices are connected in parallel. 
• The voltmeter has high resistance because the overall resistance will not change if low resistance path is offered to the current in form of voltmeter. 

Explanation:

So, Ammeter is connected in series, and the voltmeter in parallel is a correct statement. 

'An ammeter has a high resistance' is incorrect as it has low resistance. 

'A voltmeter has a low resistance' is incorrect as it has high resistance. 

So, only statement A is correct.