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The electricity used in homes, shops, hospitals and factories has to be transported large distances from power stations without energy being lost to the surroundings.
What is the name of the system that transports electricity across the UK?
The National Grid
The International Grid
The Grid system
What does a step-up transformer do?
It steps up or increases the current
It steps up or increases the voltage
It steps up or increases the resistance
How is electricity transported across the UK?
At a high current and a low voltage
At a high current and a high voltage
At a high voltage and a low current
A step-down transformer is used to do which of the following?
To step down the current when electricity leaves a power station
To step up current when electricity goes onto the National Grid
To step down the voltage when electricity comes into our homes and factories
What is the power output of a mains transformer with a current of 0.2 A flowing through it?
The power input into a transformer of 100% efficiency is 2,000 W. What will the power output be?
Less than 2000 W
More than 2000 W
The power input of a transformer is 1,200 W and the output voltage is 120 V. What will the output current be?
What is the frequency and size of the UK mains voltage?
50 Hz and 230 V ac
230 V dc and 50 Hz
50 V ac and 230 Hz
Which of the following are the correct voltages between the wires in a UK plug?
The voltage between the live and neutral wire is 230 V
The voltage between the earth and neutral wire is 230 V
The voltage between the live and earth wire is 0 V
Which of the following are safety devices used in a plug or an appliance?
Live wire, neutral wire and metal casing
Earth wire, fuse and double insulation
Live wire, fuse and earth wire