Resistance and Resistivity (Review)

Consider a wire length L, cross-sectional area A and a resistance R. A second wire at the same temperature has a length 2L and a cross-sectional are of 1/2A. What is the resistance of the second wire

• R

• 2R

• 1/2 R

• 4R

What is the resistance of a wire when its length is reduced by half?

• Halved

• Quartered

• Doubled

• Quadrupled

Xylene works in an electric company. She always recommends that longer extension cords should have a thicker diameter. Her recommendation made because resistance is __________.

• inversely with length and directly with cross-sectional area

• directly with length and inversely with cross-sectional area

• directly with both length and cross-sectional area

• inversely with both length and cross-sectional area

The electrical resistance pf a metallic conductor is inversely proportional to its _____________.

• Temperature

• Length

• Cross-sectional area

• Resistivity

What is the unit of used to specify the amount of resistance?

• Resistance

• Ampere

• Volts

• Ohm

What symbol represented the unit Ohm?

It is the opposition of a material offers to current.

• Voltage

• Current

• Resistance

• Length

Which of the following is NOT included in the factors affecting resistance?

• Temperature

• Length

• Cross-sectional area

• Color

What is the correct formular in getting the resistance?

• V=IxR

• None

What happens as more current flows through a resistor>

• It explodes

• It dissipates power 

• It cools down 

• It generates more heat