a) Define electric power.express it in terms of potential difference V and resistance R.
b) An electrical fuse is rated at 2A.what is meant by this statement?
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Answers
general definition of power is “ it is the the capacity to do something in a particular way ”
but in physics , “it is the rate of energy consumed with respect to time.”
now you can say, “electric power is the rate at which electrical energy consumed in a electric circuit. ”
i.e., electric power = electrical energy consumed/time taken to consumed energy.
from Joule law,
electrical energy/heat consumed during time t = i²Rt
so, electric power = i²Rt/t = i²R
from ohm's law, V = iR
so, electric power = (V/R)²R = V²/R
hence, electric power in term of V and R is given by, P = V²/R
(b) electrical fuse is rated at 2A. it means, maximum current 2A can be passed through the fuse.
whenever a current more than 2A is passed through the fuse, it will be destroyed (or melt).
Answer:Elecrtic power:It is the rate of doing work by an energy source or the rate at which electric energy is dissipated is called electric power.
So, power(p)= workdone(w)/time(t)
=VI =v²/r
(b) it means,the maximum current will flow through it is only 2A.fuse wire will melt if the current exceeds 2A value through it.
(c) Given:P=1kw=1000 w, V= 220 v
Current drawn, I=p/v =1000/220 =50/11=4.54A.
To run electric iron of 1kw,rated fuse of 5A should be used.
I think that answer help you