ac led circuits

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 to that..

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..

>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..