ac circuits voltage

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 reach maximum and zero value at the same instant..

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..

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..

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 of EMF E be connected to a pure resistance R. The instantaneous EMF from the sourc..

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..

Voltmeter and Ammeter - These devices measure the voltage and current respectively in a circuit. The basic component of both is the moving coil galvanometer which produces a deflection proportional to the electric current through ..

Electromotive Force (EMF) and Voltage - No current flows in a copper wire by itself, just as water in a horizontal tube does not flow. If one end of the tube is connected to a tank with water such that there is a pressure difference between the two ends of the horizontal tube, water flows..

. Other repeating coils, connecting other pairs of subscribers, may be tied in at the points BC, B'C', and when G, connected will offer extremely high impedance to the flow of voice current from one channel to the other, but practically none to the flow of voice current in its own channel. The talk..

>This frequency for which the current in AC circuit reaches a peak value and the A.C circuit behaves like a pure resistive circuit is called resonant frequency. The following diagram shows the variation of frequency with I o . Notice that as the val..