Resistance

Which of the following factors would decrease the resistance of an electrical cord?

• Increasing the resistivity

• Increasing the length of the cord

• Increasing the cross-sectional area of the cord

• Decreasing the cross-sectional area of the cord

By how much will resistivity change if length is kept constant but cross sectional area is doubled?

• The resistivity will be halved

• The resistivity will double

• The resistivity will be quadrupled

• The resistivity will not change

Which of the following actions would decrease the resistance of a wire by a factor of 2?

• Tripling the cross-sectional area of the wire

• Halving the cross-sectional area of the wire

• Doubling the cross-sectional area of the wire

Resistance changes with the temperature of wire.

• True

• False

SI unit of Resistance is

• Volt

• Watt

• Ohm

• Ampere