It is a device which strengthens weak AC signals. The process of strengthening the weak signals is know as amplification.

Capacitor consists of two similar parallel metal plates.One is positively charged and other is negatively charge.

The meaning of diode is two so diode is vacuum bulb with two elements (electrodes ) namely cathode (emitter ) and anode.

Integrated circuit is a single semiconductor chip which can perform the operation of many components.

A light emitting diode (LED) is a two-lead semiconductor light source. It is a p–n junction diode, which emits light.

A photo resistor (or light-dependent resistor, LDR, or photocell) is a light-controlled variable resistor.

Combination of many ICs is called microprocessor.A microprocessor can compute data.

A motor is a mechanism by which electrical energy is converted into mechanical energy.

Rectifier is a device which converts AC and DC. This process of converting AC To DC is called rectification.

An electrical device which has the property to oppose the current passing through it is known as resistor.

If two diodes connected in this way that their same terminals either P or N at a junction point,it is called transistor.

The transformer is a device for transiting electrical energy from alternating current circuit to another.