Electrical Engineering ⇒ Topic : A.C. Circuit Containing Resistance Only
A.C. Circuit Containing Resistance Only
When an alternating voltage is applied across pure resistance, then free electrons flow (i.e. current) in one direction for the first half-cycle of the supply and then flow in the opposite direction during the next half-cycle, thus constituting alternating current in the circuit.
Consider a circuit containing a pure resistance of RΩ connected across an alternating voltage source [See Fig. (a)]. Let the alternating voltage be given by the equation
v = Vm sin ωt
As a result of this voltage, an alternating current i will flow in the circuit. The applied voltage has to overcome the drop in the resistance only i. e.
v = iR
Substituting the value of y, we get,
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