Resistivity-10D

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

which has the highest current flowing through it?

• R1
• R2
• R3
• All the same

A wire has a resistance R.

What is the resistance when both the length and radius of the wire are doubled?

• R/4

• R/2

• 2R

• 4R

Two resistors R1 and R2 are made of wires of the same material. The wire used for R1 has half the diameter and is twice as long as the wire used for R2.

What is the value of the ratio resistance of R1 / resistance of R2?

• 8

• 4

• 1

• 0.5

A tungsten wire has resistance R at 20°C. A second

tungsten wire at 20°C has twice the length and half the

cross-sectional area of the first wire. In terms of R,

the resistance of the second wire is ...

• R/2

• R

• 2R

• 4R

A conductor obeys Ohm law if....

• the current in it is inversely proportional to the potential difference across its end

• the current in it is directly proportional to the potential difference across its end

• the resistance in it is directly proportional to the potential difference across its end

• the current in it is directly proportional to the resistance across its end

The conductor with higher temperature 

• high resistance 
• low resistance 
• same resistance 
• it does not affect the resistance 

Tags

NGSS.HS-PS2-5