Engaa electricity question help

For the ENGAA Specimen Section 2 Q2b, why is the current when calculated using I=P/V correct but when using I=V/R it gives a different current? What is actually being calculated when doing V/R? Thanks for any help :smile:

Paper-
https://www.physicsandmathstutor.com/pdf-pages/?pdf=https%3A%2F%2Fpmt.physicsandmathstutor.com%2Fdownload%2FAdmissions%2FENGAA%2FPapers%2FENGAA%2520Specimen%2520Section%25202.pdf

Solutions-
https://www.physicsandmathstutor.com/admissions/engaa/solutions-specimen/

Reply 1

hello665

5

So not all the voltage in v/r is going to the resistance in the wires, but the current is the same as it is series, as well as the total power, so you use the total power/total voltage to get current.

Reply 2

DFranklin

18

Original post by Cryotene

For the ENGAA Specimen Section 2 Q2b, why is the current when calculated using I=P/V correct but when using I=V/R it gives a different current? What is actually being calculated when doing V/R? Thanks for any help :smile:

Paper-
https://www.physicsandmathstutor.com/pdf-pages/?pdf=https%3A%2F%2Fpmt.physicsandmathstutor.com%2Fdownload%2FAdmissions%2FENGAA%2FPapers%2FENGAA%2520Specimen%2520Section%25202.pdf

Solutions-
https://www.physicsandmathstutor.com/admissions/engaa/solutions-specimen/

This is a physics question - why are you posting it in the maths forum?

Engaa electricity question help

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you