Question

The current flowing through a resistor connected in an electrical circuit and potential difference developed across the ends are shown in the given ammeter and voltmeter find least count of both and what is the voltage across the given resistor

Answer 1

voltage v=06v , current i=0.4 A ,

voltmeter least count=0.5÷10=0.05

ammeter least count=0.25÷10=0.025

resistance R=V/i ( from ohm's law)

R=06/0.4=3/2=1.5Ω

Answer 2

Answer:

LC of ammeter =  0.2 / 10

= > 0.02 A

A = 0.02 A

LC of Voltmeter =  1 / 10

= > 0.1 V

V = 0.1 V

Current = 15 x 0.02 A = 0.3 A

Potential difference = 21 x 0.1 V = 2.1 V