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Electric
circuits
Resistance
R of a uniform conductor :
Resistors
in series :
R
=
R1 + R2 + R3 Resistors in parallel
:
Power
dissipated in resistor :
Potential
drop across R
= V = I R Kirchoff's
first law (Junction Theorem)
At a junction, the total current entering the junction is equal to the total current leaving the junction.
Kirchoff's second law
( Loop Theorem ) The net e.m.f. round a circuit is equal to the sum of the p.d.s round the loop.
The
maximum power theorem Power dissipated in a load is maximum when the resistance of the load is equal to the internal resistance of the source.
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