Question

7. An engineer is using a wire that has a resistance of 1.5. This resistance is too high for the application he is designing. The wire must be exactly 2.5 cm long. What two things could he do to reduce the wire's resistance? (4 points)

Answer 1

The two things the engineer can do to reduce the resistance of the wire are:

• Increase the cross-sectional area of the wire
• Decrease the length of the wire

How to calculate the resistance of a wire?

The resistance of a wire is given by the formula:

R = ρL/A

where;

• R is the resistance
• ρ is the resistivity of the material
• L is the length of the wire, and
• A is the cross-sectional area of the wire

To reduce the resistance of the wire, the engineer can do the following;

Increase the cross-sectional area (A): By increasing the cross-sectional area of the wire, the resistance will decrease.

Decrease the length of the wire (L): By decreasing the length of the wire, the resistance will decrease.

Answer 2

Step-by-step explanation:

The resistance of a wire depends on the length of the wire and the area of crossection of wire.

resistance is directly proportional to the length of the wire

and inversely proportional to the area of crossection of the wire.

So, to decrease the resistance, length should be decreased and the area of crossection should be increased.