ac circuits tutorial

AC Circuit Containing Resistance only - Let an AC source of EMF E be connected to a pure resistance R. The instantaneous EMF from the source is given by E = E o sin w t From Ohm's law I = E/R = E o /R . sin w t I = I o sin w t The variation of E and I shows that both r..

Let an AC source be connected across pure inductive element. If E = E o sin w t then, q = EC = CE o sin w t I = I o cos w t Here I o = E o C w = E o C w plays the role of a resistance and is known as capacitive reactance X c ...

Let an AC source be connected across pure inductive elemen..

AC Circuit Containing Resistance, Inductance and Capacitance Circuit (LCR in series) - When an AC source is connected in a circuit with a resistance and a reactance together, the current varies initially in a complex way. After sufficient time, a si..

Let an AC source be connected across a pure inductive element. If the alternating current I = I o sin w t flows through it. Then According to Kirchhoff's Law E = E o cos w t or..

When an AC source is connected in a circuit with a resistance and a reactance together, the current varies initially in a complex way. After sufficient time, a sinusoidally varying current persists in the circuit. This steady state current has a frequency equal t..

An electric circuit is a compete or closed path through which the charge can flow. When the switch is open or the circuit is broken, it is called the open circuit. Electric current will not flow through the open circuit...

The impedance of LCR is In expression (1), I o has different values for different frequencies. But I o has a maximum value when Z is minimum. i.e., when X L = X L c or Z = R since w = 2 p f This frequency for which the current in AC circuit reaches a peak value and the A.Ch..

An AC generator consists of a magnet with concave cylindrical poles, an armature, and a current collecting arrangement. The current collecting arrangement consists of slip rings and brushes. Armature is a soft iron core on which a coil having a large number of turns of insulated copper..

>Total work done or energy spent in maintaining current over one full cycle. The second term is zero over complete cycle i.e., Therefore, The quantity cos q is called the power factor of the AC circuit and we kn..