Question

a) A 35.5-m length of copper wire at 20.0°C has a radius of 0.27 mm. If a potential difference of 7.0 V is applied across the length of the wire, determine the current in the wire. (Use the values in this table.)

b) If the wire is heated to 40.0°C while the 7.0-V potential difference is maintained, what is the resulting current in the wire?

Answer 1

do u know ohm's law

Answer 2

ohm's law is
\[V=IR\]

Answer 3

u hv to use
\[R=\frac{ \rho L }{ A }\]

Answer 4

u hv to use
\[R _{\theta} =R _{0}(1+\alpha \theta)\]

Answer 5

anyway
welcome to openstudy

Answer 6

response to get better help!!!