# Urgent HELP PHYSICS Please quick!!! ELECTRICITY QUICK QWatch

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#1
why does R = emf... when no little r? says R increases r constant to emf HUH???????? help!!!!!!!!!
0
4 weeks ago
#2
I'm not to sure if it is R=emf but maybe R∝emf. Since emf=I(R+r) and if r=0 then emf=IR where if I is constant then R∝emf. Is that what you are trying to get at?
0
#3
wow, smart! thanks.

The question is confusing, well the mark scheme states R is equal to the emf value, i suppose it means V terminal pd = emf when theres no internal resistance?

(Original post by saj9122)
I'm not to sure if it is R=emf but maybe R∝emf. Since emf=I(R+r) and if r=0 then emf=IR where if I is constant then R∝emf. Is that what you are trying to get at?
0
4 weeks ago
#4
Yeah that makes a lot more sense because emf=IR when IR is pd across terminal. Good luck for tomoz though man, hope the paper will not be impossible lol
wow, smart! thanks.

The question is confusing, well the mark scheme states R is equal to the emf value, i suppose it means V terminal pd = emf when theres no internal resistance?
0
#5
thanks bro
(Original post by saj9122)
Yeah that makes a lot more sense because emf=IR when IR is pd across terminal. Good luck for tomoz though man, hope the paper will not be impossible lol
0
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