The connecting cable of electrical appliances like electric iron, water heater or room heater contains three insulated copper wires of three different colours-red, green and black. Which one of the following is the correct colour code?

CONCEPT:

• The device which uses electricity to do a function is called an electrical appliance.
• For example electric iron, water heater, or room heater.
• Resistor Colour Coding is a method that uses color bands to identify a resistor’s resistance value and its percentage tolerance easily.

There are three types of wires in connecting cables:

1. Live wire:

The wire which carries electric current to the appliances is called a live wire.

2. Neutral wire:

The wire which completes the circuit by forming a way to current back to the mains is called a Neutral wire. The neutral wire is at zero volts generally.

3. Earth wire:

The wire of very low resistance which is generally connected to the earth is called earth wire.

EXPLANATION:

• The color of the live wire is taken as red in which current flows to the appliances.
• The color of the neutral wire is taken as black which completes the circuit.
• The color of the earth wire taken is green. Hence option 3 is correct.