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Question

A tube light of 40 W runs at 220 V. What is the current in the tube light and how much energy in kWh it will consume in 10 hours?


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Solution

Step 1: Given data:

Power=40WVoltage=220VTime=10hours

Step 2: Find the current of the tube light:

Power(P)=Voltage(V)xCurrent(I)Current,I=PVI=40220=0.18A

Step 3: Find the energy consumed by the tubelight:

Eneryconsumed(kWh)=Power(kW)xRunningtime(hr)=40x10=400kWh.

Hence, the tube light of 40W running at 220V will consume 400kWh energy, whereas 0.18A current is passing from the same tube light.


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