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Ohm's Law
where,
I = current, amp
V = potential difference, volts
R = resistance, ohms
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Resistivity
where,
ρ = resistivity or specific resistance,
ohm-m
L = length of wire, m
A = cross-sectional area of wire,
m2
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Conductance (G)
where,
γ = conductivity or specific conductance, mhos/m
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Electric Power
where,
P = electric power, watts
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Electric Energy
where, E = electric energy, Joules
V = potential difference, Volts
I = Current, Amperes
R = resistance, ohms
t = time, seconds
E = 0.24I2Rt, cal
For Battery
where
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Kirchhoff’s Law
(i)
The algebraic sum of all the currents directed towards a junction point
is zero.
(ii)
The algebraic sum of all the voltage rise taken in a specified
direction around a closed circuit is zero.
Series Circuits:
Parallel Circuits:
Coulomb’s Law
The force acting between two charged bodies q1
and q2 in air is proportional to the product of
charges and inversely proportional to the square of the
distance between them.
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