Question

If percentage change in current through a resistor is 1% then the change in power through it would be
01) 1%
O2) 2%
3) 1.7%
O4) 0.5%​

Answer 1

Given:

The percentage change in current through a resistor is 1%.

To find:

% change in power ?

Calculation:

The general expression of POWER in electric circuit is :

$P = {i}^{2} \times R$

• Now, for small errors in current and resistance (< 6%) , we can say:

$\implies \: \dfrac{\Delta P}{P} = 2 \bigg( \dfrac{\Delta i}{i} \bigg) + \dfrac{\Delta R}{R}$

• Now, since resistance is constant, value of ∆R/R = 0%.

$\implies \: \dfrac{\Delta P}{P} = 2 \bigg( 1\%\bigg) + 0\%$

$\implies \: \dfrac{\Delta P}{P} = 2 \%$

So, percentage change in power is 2%.

Answer 2

Answer:

to feeling condition in power

Explanation:

pp1 pp2 EP 17 pp01 5