Question

An electric current of 8 A is made to flow through a room heater of resistance `30 omega`. Calculate
(1) the potential difference across the heater.
(2) the power supplied to the heater.
(3) the amount of heat energy liberated from it in one minute.
(4) If the heater is used for 10 hours daily in the months of December, then find the num ber of units of electrical energy consumed by it.

Answer 1

(i) `1. V = iR`
2. `P = V xx 1`.
3. `Q = V xx i xx t`
4. `Q = P xx t`
5. `1 kWh = 1` unit
(ii) `240 V, 1.92 kW, 115.2 kJ, 595.2` units