Question

An electric heater is used to 220v supply and take a current of 3.4A. calculate its power and its resistance when it is in use

Answer 1

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Here's your answer...

Given:
V = 220 V
I = 3.4 A

Power = V×I
= 220×3.4
= 748 W
Resistance = V²/P
= 220×220 / 748
= 64.7 ohm (approx.)

Answer 2

Explanation :

Given that,

Voltage, V = 220 V

Current, I = 3.4 A

Power is given as :

$P=VI$

$P=220\ V\times 3.4\ A$

$P=748\ W$

Also, $P=I^2R$

$R=\dfrac{P}{I^2}$

$R=\dfrac{748\ W}{(3.4\ V)^2}$

$R=64.7\ \Omega$

Hence, this is the required solution.