Question
An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the electric bulb?
Answer: Option B
:
B
Given, energy E=7.2kJ=7.2×103J and time t=2minutes=2×60=120s.
We know, power, P=EnergyorWorkt=7.2×103120=60W.
∴ The power of electric bulb is 60W.
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:
B
Given, energy E=7.2kJ=7.2×103J and time t=2minutes=2×60=120s.
We know, power, P=EnergyorWorkt=7.2×103120=60W.
∴ The power of electric bulb is 60W.
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