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Question
An electrical appliance having a resistance of 200 Ω is operated at 200 V. Calculate the energy consumed by the appliance in 5 minutes in joules.
Solution
Given, Resistance, R = 200 Ω
Voltage, V = 200 V
time, t = 5 min
= 5 × 60 sec
= 300 sec
As, Energy, E = `("V"^2"t")/"R"`
In joules
E = `((200)^2 xx 300)/200`
E = 60000 J
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