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.Also calculate energy consumed in 10 minutes in kwh

Answer 1

V= 220V

I= 3.4A

i)

P=VI

P=220×3.4

P= 748W

ii)

T= 10 min OR 1/6 hours

R= V/I

R= 220/3.4

R= 64.7Ω approx

iii)

H=VIT           (T-time)

H=220×3.4×1/6

H=124.6 WH

OR 124.6/1000 KWH

OR 0.1246 KWH