1.      An electric heater is powered by a 220 V supply. If its resistance when hot is 25 Ω, what power rating should it have?

1.      Basic protection is defined as

1.      Study the sine wave shown here, which is a representation of an AC voltage, and then answer the question. Which letter represents the peak-to-peak value?

1.      To provide protection against electric shock, the protective measure of double reinforced insulation relies on basic insulation and

1.      What is the period of this waveform?

1.      A resistor is to be used on a 5 V supply and is expected to have a current of 0.08 A flowing through it. Which of the following power ratings would NOT be suitable for the resistor?

1.      Where should a fuse be positioned in a circuit?

1.      Fault protection may be provided by