Energy used by lightbulb and the thermal energy generated.
Answer to Problem 68A
Explanation of Solution
Given:
Power rating of light bulb,
Time,
Percentage of energy converted to light,
Formula Used:
The energy power relation is given as,
Where,
Calculation:
On putting the given values,
As bulb is having efficiency of 12% which means 88% of energy is lost to heat, so
Thermal energy generated in 0.5 hour is,
Conclusion:
Therefore, energy used by light bulb is
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