Physics doubts !

[rainbowtiara24]

Hello ! I am new here ! and on my first day ....I have doubts !
It's physics paper 6 w05 q1) part c and also to reduce the heating effect of current we need to increase voltage right ??

 

[HorsePower]

yes, voltage needs to be increased to decrease heating effect.

 

[Ahmooosh]

okay i have this question , isnt more voltage = more current?

i know from paper 1s that more voltage reduces heating effect , but why is that?

 

[HorsePower]

yeah exactly i have the same doubt..

 

[rainbowtiara24]

The thing is they say that when transferring electricity they step up / increase voltage so that there is less energy lost as heat
but a few mark schemes say that to reduce heating effect of current we should decrease voltage !!!!

 

[KareemXPF]

Increase Voltage will reduce heat loss
Increase Current will increase heat loss
& about the point of Voltage increase = current increase. just remove it from your mind cause they wont ask you further more then that

 

[Gunner1995]

in transformers. Increase voltage/decrease current. In normal circuits. MORE VOLTAGE. MORE CURRENT

 

[KareemXPF]

Your right Gunner

 

[HorsePower]

thnx

 

[KareemXPF]

Its ok bro.. anyhelp im there

 

[rainbowtiara24]

thank you guys

 

[vampire542]

okay...so i wrote 2 points:-
1. use a wire with a high specific heat capacity to reduce alterations in resistance due to an increase in temp.
2. reduce the current flowing through the circuit.
hope that helps..

 

[Cozmo35d]

omg, the exam was soo easy, & im soo happy now , by the way I did the first varient.