State the factors on which the electrical energy consumed in a current carrying conducting wire depends
Answers
Explanation:
When current flows through a conductor,
heat energy is generated in the
conductor. The heating effect of an
electric current depends on three
factors:
1The resistance, R of the conductor. A
higher resistance produces more heat.
2The time, t for which current flows. The
longer the time the larger the amount of
heat produced.
3The amount of current, I. the higher the
current the larger the amount of heat
generated.
Hence the heating effect produced by an
electric current, I through a conductor of
resistance, R for a time, t is given by H =
I2Rt. This equation is called the Joule’s
equation of electrical heating.
Electrical energy and power
The work done in pushing a charge round
an electrical circuit is given by w.d = VIt
So that power, P = w.d /t = VI
The electrical power consumed by an
electrical appliance is given by P = VI =
I2R = V2/R
Example
An electrical bulb is labeled 100W, 240V.
Calculate:
a)The current through the filament when
the bulb works normally.
b)The resistance of the filament used in
the bulb.
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