Factors of Resistance

Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistance and two insulators.

How will the resistance of a wire be affected if its

1. length is doubled, and
2. radius is also doubled ?

Give justification for your answer.

Name the electrical property of a material whose symbol is "omega".

The effective resistance between A and B is:

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be:

 What happens to the resistance as the conductor is made thinner?

What would be the effect on the resistance of a metal wire of:

increasing its length?

A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10⁻⁸Ω m. What will be the length of this wire to make its resistance 10 Ω? How much does the resistance change if the diameter is doubled?