Heating Effect of Electric Current - Electricity Video Lecture - Class 10

heating effects of electric current let
us understand the heating effect of an
electric current in this video we know
that the battery or a cell is a source
of electrical energy the chemical
reaction within the cell generates the
potential difference between its two
terminals that sets electron and motion
to flow the current through an assister
our system of assisters connected to the
battery in order to maintain the current
the source has to keep expanding its
energy however a part of the source
energy in maintaining the current may be
consumed into useful works like in
rotating the blades of an electric fan
rest of the source energy may be
expanded in heat to raise the
temperature of the gadget we often
observe this our daily lives for example
an electric fan becomes warm if use
continuously for a long time on the
other hand if the electric circuit is
purely resistive that is a configuration
of resistors only connected to a battery
the source energy continually gets
dissipated entirely in the form of heat
this is known as the heating effect of
an electric current
this effect is utilized in devices such
as electric heater electric iron and
electric toasters and others consider a
current I flowing through a resistor of
assistance are with the potential
difference across it we let t be the
time during which the charge Q flows
across the work done moving the charge Q
through a potential difference V is V Q
therefore the source must supply energy
equal to V Q in time T is the power
input to the circuit by the source is P
is equal to V into Q by T is equal to e
I or the energy supplied to the circuit
by the source and time T is P into T or
VI into T this energy expended by the
source gets dissipated in the resistor
as heat thus for a steady current I the
amount H produced in time T is 8
is equal to vit applying Ohm's law that
is V is equal to IR to this equation we
get H is equal to I square into RT this
is known as joules law of heating the
law implies that the heat produced in a
resistor is directly proportional to the
square of the current for a given
resistance directly proportional to the
resistance for a given current and
directly proportional to the time for
which the current flows through the
resistor in practical situations when an
electric appliance is connected to a non
voltage source the equation representing
the joules law of heating is used after
calculating the current through it by
using the equation I is equal to we are