By Peter Bowers, Joe Sewell, Don Greer
Publication by means of Peter Bowers
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Circuit breakers Some kinds of circuit breaker are used instead of fuses to protect a faulty appliance from drawing too much current. A thermal circuit breaker becomes overheated by excess current passing through it. This triggers the breaker switch to open. A residual current circuit breaker (RCCB) has a different action. It switches off the mains supply to an appliance when it detects a leakage of current to earth or to another circuit. For example, an exposed metal part of an appliance (such as its case, or a control knob) may become ‘live’ because of faulty insulation.
9 ms. What is its frequency? 3 Describe this waveform: 4 The ‘bleep’ of a microwave oven has a frequency of 1000 Hz. What is its period? Things to do The AC plotted above has an amplitude A = 1 V. It has a period P = 1 s. If we plot a graph of the sine of an angle from 0º to 360º, it has exactly the same shape as one cycle of the AC graph. The AC has a sinewave shape. Not all AC has this shape, but this is the commonest. The mains AC and any AC from mains transformers are sinewaves. Frequency The unit of frequency is the hertz.
One, labelled 0V, is the negative terminal of the power supply. The other is labelled with the voltage of the positive terminal of the supply. The supply may be a cell or battery, but it is more likely that you will obtain the supply from a bench PSU. • Ohms symbol: This is omitted. Instead we use a shorter form, using the resistor printed code (p. 43). Design point 2 Use the multimeter to check that the divider is working. 6 V. 3 Connect the load resistor (10 kΩ) to the divider. Measure the output voltage again.