one small question: In a power cable. There is high voltage, thus low current due to P=VI and with lesser curent, there is less heat loss/ energy loss/ power loss?
My doubts are in the bolded areas.
Firstly, in a cable, voltage high means current low is that correct?
Secondly, is it heat loss or energy loss or power loss? Particularly the latter 2, it is quite confusing.
Also, for the qn 4, you have to minus the mgh cos you must take into accnt the gravity.
Originally posted by davidche:one small question: In a power cable. There is high voltage, thus low current due to P=VI and with lesser curent, there is less heat loss/ energy loss/ power loss?
My doubts are in the bolded areas.
Firstly, in a cable, voltage high means current low is that correct?
Secondly, is it heat loss or energy loss or power loss? Particularly the latter 2, it is quite confusing.
1) Yes, because power is a constant in the transmission. You cannot suddenly increase the power (or rate of energy flow) for no reason.
2) They are actually about the same thing. Power loss is energy loss per unit time.