Potential difference calculation

[ellieee]

Homework Statement

for the 2 resistors in parallel, is is true that only need to find p.d across one of them (eg. (5.0)(1.0)=5.0V) to determine the p.d across both parallel resistors ? in this case (2.0.)(2.5) = (5.0)(1.0), but what If the p.d across resistor A not equal to that of B, then which resistor do you calculate the p.d of?

Relevant Equations

V=IR

 

[Orodruin]

That cannot happen.

 

[Tom.G]

For these types of school problems, a wire is considered to be 'perfect'; specifically that is: "The potential at any point on a wire is the same as the potential at any other point on that wire."

Keeping that in mind, since the respective ends of the two resistors A and B are connected by wire, they are at exactly the same potential.

Hope this helps!

Cheers,
Tom