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Solar and Wind Energy

A man harness...

Question

A man harnesses solar energy to charge his eco-friendly car, the solar cells installed has an efficiency of 90%. If fully charged the car runs for 100 km and for each km the enrgy spent is 50 J. If the solar energy received is 2000J then the maximum Kilometres the vehicle would run is(Assume that there is no other energy loss due to other dissipative forces)

A

18 km

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B

36 km

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C

54 km

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D

90 km

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Solution

The correct option is B
36 km

The solar energy received from sun is 2000J, therefore the enrgy available for car is 90% of 2000J since the efficency of the solar panel is 90%. 90/100 x 2000 = 1800 J. The car can spend 1800J of energy, since the car requires 50J for each km therefore 1800/50 = 36 Km

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