1.

A potential difference of 220 V is applied across a resistance of 440 Omegain an electrical appliance. Calculate the current drawn and heat energy produced in 20 seconds.

Answer»

Solution :V=220 V
R = 440 `Omega`
1=?
H =?
V= IR
`I = (V)/(R)`
`=(220)/(440)`
`=(1)/(2) = 0.5 A`
I =0.5
`H = I^(2) Rt`
`=(0.5)^(2) xx440xx20`
H =2200 J


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