Question

A potential difference of 220V is a applied across a resistance of 440Ω in an electrical appliance. Calculate the current drawn and the heat energy produced in 20 seconds.V= 220 V R= 440 ohm I=V/R=220/440=0.5 A Heat energy = I2RT = = 2200 KJ = 2.2J

Answer 1

V=220

R=440

I=?

T=20sec

V=IR

220=I×440

I=1/2  = 0.5A

H=I²RT

H=(0.5)²×440×20

H=0.25×8800

H=2200 joule