Discussion
Consider the following statements about vehicle lighting.
1. Direction indicators must flash between 60 and 120 times a minute.
2. White light must not be shown to the rear except by reversing lamps.
3. Light output is directly proportional to supply voltage.
Which of the statements given above is or are correct?
Answer: B
The first two are correct, but light output varies with roughly the cube of voltage or more. That steep relationship is why a small voltage drop in the wiring costs a surprisingly large proportion of the light. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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