Hertz experiment
The principle of Hertz experiment:
The existence of electromagnetic waves was confirmed experimentally by Hertz in 1888. This experiment is based on the fact that...
Electromagnetic Waves
Electromagnetic waves with the wavelength of the order of a few meters were first produced and detected in the laboratory by Hertz in 1887....
AC Generator
AC Generator:
AC generator is the one which produces a current that alternates or changes its direction regularly after a fixed interval of time, i.e.,...
Transformer
A transformer is an electrical device used for converting low alternating voltage into a high alternating voltage and vice versa. It transfers electric power...
Wattless Current
The current in a.c. circuit is said to be wattles if the average power consumed in the circuit is zero.
The average power of an...
Power in an AC Circuit
In an AC circuit, the current and emf vary continuously with time. Therefore power at a given instant of time is calculated and then its mean...
Resonance
Series resonance or voltage resonance in RLC circuit:
The value of current at any instant in a series RLC circuit is given by
At a particular...
LCR Series Circuit
Let an alternating source of emf e be connected to a series combination of a resistor of resistance R, an inductor of inductance L...
LC Oscillations
When a charged capacitor is allowed to discharge through a non-resistance, electrical oscillations of constant amplitude and frequency are produced. These oscillations are called...
Representation of AC Current and Voltage by Rotating Vectors
Representation of AC Current and Voltage by Rotating Vectors
The analysis of an ac circuit is by using a phasor diagram. A phasor is a...