Fuses are always connected in series
with the circuit. Therefore, its' resistance should be small compared to the resistance of the circuit.
The circuit of an Ammeter has a much
lower resistance than a Voltmeter. So
the fuse in the Ammeter has a higher
current rating. However, the fuse with the highest current rating has the lowest resistance.
Some types of fuses used to protect electric meters have resistances of several ohms. Is this objectionable (a) in ammeter circuits and (b) in voltmeter circuits? Why?
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