Question

I have a test tomorrow and I need some help with my homework!

Question. The electrical resistance of a circuit is influenced by three primary factors.

Possible Answers.
1. conductivity
2. shape
3. insulation
4. diameter
5. length

Answer 1

This should be worded the electric resistance of a conductor with DC current flowing through it.

You've probably seen this formula before:

\[R = \frac{ l }{ \sigma A }\]

and that answers the question.

Choice #2, the shape I assume means the cross-sectional shape of the conductor. This does matter if the conductor carries AC current but it is not one of the answers this question is looking for.

Answer 2

All options are fine except the third one where by insulation doesn't play any role.About shape, it does really matter because the geometry and dimensions are determined by it.