Electricity can flow either as direct or alternating current, and is used in homes to power electrical appliances. The National Grid distributes electricity throughout the country.
What kind of current is produced from a cell?
What is the mains voltage value in this country?
What is the frequency of mains electricity?
What colour is the live wire?
Green and yellow
Which wire contains the fuse?
Which is the correct description of the earth wire?
A high resistance path to ground
A low resistance path to ground
A negative resistance path to ground
What is the earth wire provided for?
If there is a fault, the earth wire carries away dangerous currents
The earth wire is needed to make the appliance work
If the neutral wire fails for some reason, the earth wire can take over
What power is transmitted by a 5 A current through a 10 Ω resistor?
How much energy is transferred in 8 minutes by a washing machine rated at 3,200 W?
Why would a lower current reduce unwanted energy transfer through low resistance wires?
The power transmitted does not depend on the voltage
A high current could blow a fuse
Power dissipated depends on the square of the current