Question

A 4 W heater is connected to a 220 V source of power. Calculate :
(i) Electric current passing through the heater
(ii) Resistance of a heater
(iii) The electric energy consumed in 2 hours use of the heater.​

Answer 1

Answer:

Explanation:

Power = 4KW = 4000 W Volt = 220 Electric power , P=VI (I)After putting values, I = 18.18 A (II)R denotes resistance here ,V= IR R= V/ I= 220 V/ 18. 18 A= 12. 1012 ohm. (III) Power= 4000 W= 4000 J/ s So, in 2 hours energy in kWh is = 4000J/ s * 3600 * 2/( 3600000)= 8 kWh