Question

An electric heater is used on 220 V supply and takes a current of 3.4 A. Calculate (i) its power and (ii) its resistance, when it is in use. (i) Power = Voltage × Current = 220 × 3.4 = 748 Watt (ii) Power = Voltage 2 / Resistance P = V2/R R = V2/P = 2202 / 748 = 64.71 Ω

Answer 1

here are the answers
748 watts
64.71 ohms

Answer 2

Power = 748 Watts

Resistance = 64.71 Ω

Explanation:

Given: An electric heater is used on 220 V supply and takes a current of 3.4 A.

So we have potential difference = 220 V and Current = 3.4 A

(i) Power can be calculated using the formula Power = Voltage × Current.

Substituting the relevant values, we get:

Power = 220 × 3.4 = 748 Watts

Power of the electric heater = 748 Watts

(ii) To calculate resistance, we can use the formula Power = Voltage^2 / Resistance

P = V^2 / R

R = V^2 / P = 220^2 / 748 = 64.71 Ohms.

Resistance of the electric heater = 64.71 Ohms.