- #1
victorhugo
- 127
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[Moderator note: Thread moved from technical section hence no template. Question text from later in the thread added to this post to make things clear]
"A power station generates electric power at 120kW. It sends this power to a town 10 km away through transmission lines that have a total resistance of 0.40 ohms. If the power is transmitted at 240 V, calculate:
a. the current in the transmission lines
b. the voltage drop across the transmission lines
c. the power loss in the transmission lines
d. the power loss in the transmission lines "
[Since question d looks an awful lot like question c, I suspect a miscopy from the original source]
Since power is in joules, i'd imagine we could get the energy in - energy out (using p=vi=i^2r).
But it doesn't work like that. My textbook states that power loss = I^2R, but why?
Could someone explain please? thank you
"A power station generates electric power at 120kW. It sends this power to a town 10 km away through transmission lines that have a total resistance of 0.40 ohms. If the power is transmitted at 240 V, calculate:
a. the current in the transmission lines
b. the voltage drop across the transmission lines
c. the power loss in the transmission lines
d. the power loss in the transmission lines "
[Since question d looks an awful lot like question c, I suspect a miscopy from the original source]
Since power is in joules, i'd imagine we could get the energy in - energy out (using p=vi=i^2r).
But it doesn't work like that. My textbook states that power loss = I^2R, but why?
Could someone explain please? thank you
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