The following lists the length and diameter of three copper wires. Wire A – 5 cm long, 10 mm thick; Wire B- 10 cm long, 5 mm thick; Wi

Question

The following lists the length and diameter of three copper wires. Wire A
– 5 cm long, 10 mm thick; Wire B- 10 cm long, 5 mm thick; Wire C – 15 cm
long, 1 mm thick. Which of these wires most likely has the highest
resistance? Help i’m taking a test

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Dâu 1 year 2021-09-03T20:25:54+00:00 1 Answers 3 views 0

Answers ( )

    0
    2021-09-03T20:27:00+00:00

    Answer:

    Resistance is proportional to length and inversely proportional to area.

    L1 =  5 cm

    L2 = 10 cm

    L3 = 15 cm

    A1 = k * (.50 cm)^2

    A2 = k * (.25 cm)^2 = 1/4 A1

    A3 = k * (.05 cm)^2= 1/100 A1

    R1 = 1 * 1 = 1

    R2 = 2 * 4 = 8 R1

    R3 = 3 * 100 = 300 R1

    R3 has greatest resistance

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