Discussion
Which function does the charge warning lamp perform beyond warning?
Answer: B
Residual magnetism alone is insufficient, so current through the lamp energises the field until the machine self excites. That is why an open circuit bulb prevents charging on many systems. The lamp is a component, not just an indicator. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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