28. Define energy. Name the physical quantity that has same unit as that of energy. Four
electrical appliances, each rated 500 W, run for 10 hours. Calculate the energy in kWh and
joules.
Answers
Answered by
1
Answer:
We usually say that,the amount of work which we can do is energy.There are many forma of energy in class 9 potential and kinetic energy i.e mechanical energy is studied.
Work done has tge same unit as energy.
Power=500W=0.5kW
we know that,
Power=work done/time
work done= power*time
= 0.5*4*10
=20J
hope it helps......
Answered by
2
Answer:
The energy may be defined as the capacity of a body to do work.
energy's unit is joules
Work's unit is also joules
Power=energy/time
energy=Power*time
500*60*10
0.5*10 (because energy has to be calculated in kwh)
so
ENERGY= 5 Kwh
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