Electric fuse:

Electric fuse: Electric fuse is a protective device used in series with an electric appliance to save it from being damaged due to high current. In general, it is a small conducting wire of alloy of copper, tin and leads having low melting point.

Pure fuse is made up of tin.

 Galvanometer: Galvanometer is a device used to detect and measure electric current in a circuit. It can measure current up to 10⁻⁶ A.

Shunt: shunt is a wire of very small resistance. In simple words, galvanometer is an instrument for detecting and measuring small electric currents.

A galvanometer can be converted into an ammeter by connecting a shunt parallel to it.

A galvanometer can be converted into a voltmeter by connecting a very high resistance in its series.

Transformer: Transformer is a device which converts low voltage A.C. into high voltage A. C. and high voltage A. C. into low voltage A. C. it is based on electromagnetic induction and can be used only in case of alternating current.

A.C. Dynamo (or generator): It is device used to convert mechanical energy into electrical energy. It works on the principle of electro-magnetic induction.

Electric Motor: It is a device which converts electrical energy into mechanical energy.

Microphone: It converts sound energy into electrical energy and works on the principle of electromagnetic induction. In other words, microscope is an instrument for changing sound waves into electrical energy which may then be amplified, transmitted or recorded.

The current generated in the power stations are alternating current having voltage22000 volt or more. In grid substations, with the help of transformer, their voltage is increased up to 132000 volt to minimize loss of energy in long distance transmission.