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An electric heater works for 30 min at 1...

An electric heater works for 30 min at 120V and takes energy of 1.2 kWh. What is the current drawn by the heater ?

Text Solution

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Given: Electrical energy,
`E=1.2 kWh = 1.2 xx 10^(3) Wh`
time, t = 30 min `(1)/(2)`hour
Potential , V = 120V
To find: Current drawn by the heater, I = ?
Energy, E = `V"I"t therefore I = (E)/(Vt) = (1.2xx10^(3))/(120xx(1)/(2))`
`I = (1.2xx10^(3)xx2)/(120) = 20A`
Current, I = 20A
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