Question

The potential difference measured across a resist is found to be (10 +- 0.1) volt and the current flowing through it is measured as (2+- 0.1) amp. then the resistance of the resistive element is​

Answer 1

Answer:

Resistance, R=

I

V

V=(8±0.5)V

I=(4±0.2)A

R=

I

V

=

4

8

=2Ω

We know from rules of error propagation.

R

ΔR

=

V

ΔV

+

I

ΔI

=

8

0.5

+

4

0.2

=0.1125

∴ % error =11.25%

⇒ R=(2±11.25)%

Answer 2

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