P3 - electornics resitivth stuff

Question 1

How do you calculate the corss sectional area of a wire?

What do we measure it with?

Answer 1

test the diammeter in at least three different places, find mean diameter.

Use micrometer as has higher resolution then most shit

Question 2

How do you stop the wire heating too much?

Answer 2

use a low current

only have it swicthed on when taking measurements