Domestic electric circuit

Electric Meter is used in the circuit to:

• Reduce the electricity Usage

• Track the electricity usage

• Increase the electricity usage

• None of these

Primary advantage of Earth (ground wire) is

• To provide return path to the current

• To supply current in the circuit

• To provide a low resistance path to the stray currents in the metal body

• None of these

Live wire is generally the wire with

• Red Insulation

• Green Insulation

• Black Insulation

• Yellow Insulation

Which of the following wires has a potential of 220V?

• Neutral Wire

• Earth Wire

• Live Wire

• All of the above

Earth wires are particularly important if the case of an appliance is made of ______

• Metal

• Plastic

• Wood

• Rubber

If the earth wire is damaged...

• The user will suffer from electric shock

• The appliance won't work

• The appliance will overheat

Q2. Why Nichrome is used for making wires of heating coils?

• 1.High melting point and low resistivity.

• 2.Low resistivity and high melting point.

• 3.High resistivity and high melting point.

• 4. It can get oxidised easily and have high melting point

Q3. Which among the following are the advantages of heating effect of current?

• 1.Can be used in electric fuse

• 2.Increases the life of several appliances in the circuit.

• 3.It helps in preventing loss of energy.

Q5. Tungsten is used for the manufacture of an electric bulb because

• A)it is malleable

• B) it is inexpensive

• C) it has a very high melting point

• D) it is a good conductor

Q6. Current in an electric circuit can exceeds it’s maximum limit when,

• 1.One device is connected to the socket.

• 2.Touching of two neutral wires.

• 3.Insulation break down.

• 4.Touching of two live wires.