Purchase Solution

# Temperature dependence of resistance

Not what you're looking for?

(a) A 5 m length of copper wire at 20°C has a radius of 0.25mm. If a potential difference of 10V is applied across the length of the wire, determine the current in the wire.

(b) If the wire is heated to 50.0°C and the 10 V potential difference is maintained, what is the resulting current in the wire?

##### Solution Summary

Detailed explanations included.

##### Solution Preview

a) We can use Ohm's law to determine the current for V = 10 V.

For copper resistivity, r = 1.7à?10^-8 Ohm m,

The resistance is,

R = rl/A ...

##### Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

##### Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.