Ch 1 L1 - P2 Electric Resistance

• 1180 m

• 11.18 m

• 12 m

• 353.55 m

• 1. 140 kg

• 1. 0.014 kg

• 1. 0.00014 kg

• 1. 0.14 kg

What happens to the resistance of an iron wire if its cross-sectional area is doubled and its length is halved?

• 1. It increases to its double.

• 1. It increases to its quadruple.

• 1. It decreases to its half.

• 1. It decreases to its quarter.

The graph shown illustrates the relationship between the applied potential difference and the electric current intensity through two conducting wires, A and B, of the same material and length at a specific temperature. Which of the two wires has a larger cross-sectional area?

• Wire B

• Wire A

• Both have the same cross-sectional area

• There is not enough information to determine

The given graph represents the electric current intensity and the potential difference on the ends of two wires, A and B, of the same material. If both wires have the same cross-sectional area and the length of wire B is 9 m, then the length of wire A is ……   

• 5.2 m

• 9 m

• 1. 40 Ω

• 1. 2.5 Ω

• 1. 5 Ω

• 1. 20 Ω

• 27

• 1/3

• 1/27

• 3/1