Resistance and Resistivity

Which copper wire has the lowest resistance?

• 1 metre of 1 mm diameter wire
• 0.5 metre of 1 mm diameter wire
• 0.5 metre of 0.5 mm diameter wire
• 1 metere of 0.5 mm diameter wire

What happens to a resistor when the temperature is increased?

• Increases
• decreases
• stay the same
• vary randomly

The length of a certain conductor of resistance 100 is doubled and its cross-sectional area is halved. Its new resistance is

• 100

• 50

• 200

• 400

Factor which does not affect the resistance

• Type of material
• Length of material
• Mass of the material
• Area of the material

Graph shows that _____________

• Resistance is directly proportional to Area
• Resistance is inversely proportional to Area
• Resistance is a constant while Area changes.
• Area is a constant while resistance changes.

which has the highest current flowing through it?

• R1
• R2
• R3
• All the same

Which one, top or bottom, offers more resistance?

• top

• bottom

• neither

The unit to measure the resistivity of a wire is 

• ohms
• Volt 
• ohms.m
• ohms.s

the current in the conductor

• R1=R2

• R1 > R2

• R2 > R1

• NONE OF THE ABOVE

the  resistance of the two conductor 

• R2 > R3
• R2 = R3
• R2 < R3
• NONE OF THE ABOVE