A 100 watt bulb working on 200 volt and ...

A 100 watt bulb working on 200 volt and a 200 watt bulb working on 100 volt have

Resistances in the ratio of 4 : 1

Maximum current ratings in the ratio of 1 : 4

Resistances in the ratio of 2 : 1

Maximum current ratings in the ratio of 1 : 2

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