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Which control feature does a heated rear screen usually have?

  • A.A timer switching it off after a period
  • B.A thermostat, which switches the element when the glass has reached the temperature required to clear it
  • C.None
  • D.An automatic cut off after a set time, since the element draws a heavy current and would otherwise load the alternator

Answer: A

The element draws twenty amps or more, so a timer limits the load. The last option explains exactly that reason, which makes it a correct and more instructive version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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