Hi guys, i have a physics science equation that i just can’t get my head around?
*cost = power × time × cost of 1 kWh
A large solar panel supplies an average of 500W of electrical power.
The cost of 1 kW h of electrical energy is 12.5p.
How long will it take the solar panel to produce £1 worth of electrical energy?
A 0.6 hours
B 16 hours
C 40 hours
D 62.5 hours
The official answer from the exam board is B, 16 hours. But i really dont have any clue what working out is involved in getting that answer. Any help would be appreciated so much, Thanks
£1 is 100 pence
100 pence divided by 12.5 pence per kW hour is 8 kW hours
8 kW hours is 8000 watt hours
8000 watt hours divided by 500 watts is 16 hours
£ 1 will give you 8000 watts of electricity, the solar panel will take 16 hours to supply 8000 watts.
Hope this helps, please please give me 10 points.
Cheers.
PS kW hours or watt hours are not watts per hour but watts multiplied by hours.
Kender Energy
