Answer:
efficiency of solar panel is 18%
Explanation:
Energy received by the sunlight is given as
here we know the dimensions of the plate as
now we have
now the power received by the sun light is given as
now the output power due to solar panel is given as
now the efficiency is given as
The amount of power change if less work is done in more time"then the amount of power will decrease".
<u>Option: B</u>
<u>Explanation:</u>
The rate of performing any work or activity by transferring amount of energy per unit time is understood as power. The unit of power is watt
Here this equation showcase that power is directly proportional to the work but dependent upon time as time is inversely proportional to the power i.e as time increases power decreases and vice versa.
This can be understood from an instance, on moving a load up a flight of stairs, the similar amount of work is done, no matter how heavy but when the work is done in a shorter period of time more power is required.