Electrical Engineering ⇒ Topic : A.C. Circuit Containing Resistance Only
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Lalan
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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,
figure (a) | |
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