Household Circuits

What would happen if electricity is transmitted at low voltage but has a higher value of current?

• Electricity cannot be transmitted

• minimum loss of energy

• greater loss of energy

What is the unit in which electrical energy is expressed in the monthly bill?

• joule

• kilowatt-hour

• kilowatt

What is the green insulated wire known as?

• live wire

• earth wire

• neutral wire

Which of the following represents properties of a fuse wire?

• high resistance and high melting point

• high resistance and low melting point

• low resistance and high melting point

Which of the following is a more accurate cause of short circuit?

• direct connection between live and neutral wire

• direct connection between neutral and earth wire

• simultaneous use of many high power rating appliances

The risk of overheating is avoided in case of high tension wires because

• the high tension wires provide large surface area to dissipate heat

• the high tension wires are made up of special wires that prevent overheating

• the high tension wire consists of a single thick wire that dissipates heat efficiently

A switch in an electrical circuit should always be connected to the

• live wire

• earth wire

• neutral wire

What is the resistance of an electrical appliance having a rating of 200 W, 120 V

• 1.7 ohm

• 24000 ohm

• 72 ohm

1 horsepower =

• 100 W

• 746 W

• 1000 W

The energy used by a 30 W bulb which is switched on for 4 hours is

• 120 kWh

• 0.12 kWh

• 1.2 kWh