Theory:

Conductors
 
In an electrical circuit, the conducting wire, which is made up of metal, allows current to pass through them. Such types of materials are called as conductors.
The materials which allow the electric current to pass through them are called Conductors.
Example:
A human body, tap water, safety pin, coins and needle are examples of conductors.
water-2057924_1280.jpg metal-950169_1280.jpg coins-3146970_1280.jpg
 
All metals are good conductors of electricity. Graphite, a non-metal used in pencil lead, is also a conductor of electricity.
 
shutterstock_1328619008_new.jpg

Insulators
 
If we use cotton thread instead of copper wire in an electrical circuit, the current will not flow through the circuit. It is so because cotton is a poor conductor of electricity, and it does not allow current to pass through it. Such types of materials are called as insulators.
The materials that do not allow the electric current to pass through them are called insulators.
Example:
A rubber band, plastic pen, rubber, wood, glass, air and pure water are examples of insulators.
shutterstock_1328619008_new1.jpg
 
Uses of conductors and insulators
 
Conductors and insulators play a major role in electrical circuits. Sockets, electrical plugs and switches are made of conductors.
 
shutterstock_264387713_new.jpg socket-1794616_1280.jpg

On the other hand, insulators such as plastics and rubber are used for covering switches, wires, plug tops, and other parts of electrical appliances.
 
Electrical Safety
 
The human body conducts electricity. Carelessness while handling electric devices can cause severe injuries. An electric shock may even lead to death.
 
shutterstock_281151263_new.jpg
 
Electricians wear rubber gloves to avoid electric shock while repairing electric switch. They also use screwdrivers and testers made of wood or hard plastic.
 
shutterstock_775400455.jpg