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True or false? In alternating current, the potential difference switches between positive and negative values.
Which of these statements are true about the UK mains supply?
Frequency of 50Hz
Frequency of 60Hz
Peak voltages of +230 and -230V
Peak voltages of +325 and -325V
Direct voltage of 230V
Direct voltage of 325V
True or false? The device used to show how alternating potential difference varies with time is called a voltascope.
What is the peak voltage of an AC supply whose peak is 3.4cm from the centre and whose Y-gain control is 0.75V/cm?
What is the frequency of an AC supply if the length of one cycle is 4cm and the time-base control is 15ms/cm?
What colour cable is the live wire in a three-core cable?
Green and yellow
What colour cable is the neutral wire in a three-core cable?
What colour cable is the earth wire in a three-core cable?
True or false? Appliances with plastic cases such as hairdryers only need two-core cable as they are doubly-insulated and do not need to be earthed.
True or false? A circuit breaker is a piece of metal that melts if the current flowing through it is too large.
What fuse would you need to buy if an appliance drew 2.7A of current?
True or false? Residual current circuit breakers break if the current in the live wire is different to the current in the neutral wire.
Which of these equations connecting power, energy and time is correct?
P = E/t
P = t/E
P = Et
Which of these equations connecting power, current and potential difference is correct?
P = I/V
P = V/I
P = IV
What fuse would I buy if I bought a 230V, 1000W appliance?
How many units of charge would each electron carry if they carried 6A of current in 1 minute?
True or false? The equation connecting charge, potential difference and energy is Q = VE.
What would be the potential difference of circuit in which 2000J of energy were carried by electrons with a charge of 4C?
True or false? Connecting too many appliances to a single socket can lead to overheating.
Which of these are considered energy-efficient bulbs?
Compact fluorescent bulbs