A lamp rated 100V, 75A is to be connected across 230V source. Determine the value of the resistance?
connected in series with the line so that voltage across the bulbs does not exceed 110V.
75 amps, really?
I think that is 75 watts, which means the current is 75/100 = 0.75 amps, and the resistance is 100/0.75 = 133 ohms.
so we have a voltage divider from 230 volts with unknown R and 133 ohms, with 110 volts across the 133 ohms. Current = 110/133 = 0.83 amps. Unknown R = 120/0.83 = 145 ohms
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