Question

Assertion: A voltmeter and ammeter can be used together to measure resistance but not [1] power.
Reason : Power is proportional to voltage and current.
a) Both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion.
c) Assertion is CORRECT but, reason is INCORRECT.
b) Both assertion and reason are CORRECT but, reason is NOT THE CORRECT explanation of the assertion.
d) Assertion is INCORRECT but, reason is CORRECT.

Answer 1

Answer:

Voltmeter is an electric instrument used for measuring electric potential difference between the two points in an electric circuit.

An ammeter is a device used to measure the electric current in the circuit.

As we know, R=  

I

V

​  

 from Ohm's law and P=VI

So we can measure resistance and power from voltmeter and ammeter used together. Resistance is  proportional to voltage and inversely proportional to current but power is directly proportional to both voltage and current.

Explanation: