Electrical energy and joules law class 10 | 10th physics | punjab, federal, kpk, balochistan board

Electrical energy and joules law class 10 | 10th physics chapter 14 electrical energy and Joules law in urdu

14.10 ELECTRICAL ENERGY AND JOULE'S LAW
Turbine runs generator to produce electrical energy when
water falls on it from higher gravitational potential to lower
gravitational potential. Similarly, when charge moves from a
higher electric potential to a lower potential, it delivers
electric current. Thus, the process during which charges
continuously move from a higher potential to a low

potential, becomes a continuous source of electrical energy.
Consider two points with a potential difference of V volts. If
one coulomb of charge passes between these points; the
amount of energy delivered by the charge would be joule. V
Hence, when Q coulomb of charge flows between these two
points, then we will get QV joules of energy. If we represent
this energy by W, then
Electrical energy supplied by Q charge W = QV joules
Now current, when charges Q flow in time t, is defined as:
or Q = It
So the energy supplied by Q charge in t seconds = W = V x I x t
This electrical energy can be converted into heat and other
forms in the circuit.
From Ohm's law, we have V = IR
So the energy supplied by Q charge is
This equation is called Joule's law, stated as:
The amount of heat generated in a resistance due to flow of
charges is equal to the product of square of current I,
resistance R and the time duration t.
This energy can be utilized for different useful purposes. For
example, bulb converts this energy into light and heat, heater
and iron into heat, and fans into mechanical energy. Usually,
this energy appears as heat in the resistance. This is the reason
that we get heat when current passes through a hea

Queries solved in this video
1. what is Joules law
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