Kirchhoff's Laws & Measuring Instruments
Given below are two statements: One is labelled as Assertion and the other is labelled as Reason .
Assertion A: For measuring the potential difference across a resistance of , the voltmeter with resistance will be preferred over voltmeter with resistance .
Reason R: Voltmeter with higher resistance will draw smaller current than voltmeter with lower resistance.
In the light of the above statements, choose the most appropriate answer from the options given below.
Show answer and solution
Answer: (a)
- A good voltmeter should draw as little current as possible, so it should have a much larger resistance than the resistor.
- The voltmeter disturbs the circuit less, so it is preferred: A is false.
- For the same p.d., is smaller for larger : R is true.
- So the answer is (a).