What is the PD across the source if 1,000 watts of electric power is transmitted to a device by means of two wires, each of which has a resistance of 2 ohms and the resulting potential difference across the device is 100 volts?
Answers
Explanation:
What is the PD across the source if 1,000 watts of electric power is transmitted to a device by means of two wires, each of which has a resistance of 2 ohms and the resulting potential difference across the device is 100 volts?
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“Across the source” is an ambiguous condition. Power is dissipated in, not across loads.
The source will have a resistance (unsurprisingly called the “source resistance”) in which power will be dissipated, but this resistance is not mentioned in the question. Therefore e cannot calculate the power dissipated in the source.
Perhaps the OP meant “how much power must be delivered to a load which dissipates 1000 watts at 100 volts when the resistance of the two wires feeding the load is 2 ohms each?”
If that’s the case you would a) calculate the current in the circuit, b) calculate the power dissipated in one wire when that current is passed through it, c) double the answer found in b), and d) add the power dissipated in the wires to the power dissipated in the load.
Now it’s time for you to do your homework - I have explained how.