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Per13_exercise

Per13_exercise - Solutions to Period 13 Exercises E.1 What...

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Solutions to Period 13 Exercises E.1 What is the resistance of a 50 cm length of silver wire that has a cross sectional area of 0.005 m 2 ? The resistivity of silver at room temperature is 1.6 x 10 –8 m. a) 1.6 x 10 –8 m b) 1.6 x 10 –6 m c) 1.6 x 10 –4 m d) 3.2 x 10 –4 m e) 3.2 x 10 –2 m E.1 = b A L R ρ = 6 2 8 10 x 6 . 1 m 005 . 0 m 50 . 0 x ) m 10 x 6 . 1 ( - - = = 13-Ex 1

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E.2 The wire resistors shown below are made from the same material. For each pair, which wire would you expect to have greater resistance? Why? #1 #2 a) b) c) a) Resistor #2 has more resistance because it is longer. b) Resistor #1 has more resistance because it has a smaller cross sectional area. c) Resistor #2 has greater resistance because it is at a higher temperature. 13-Ex 2
E.3 What is the voltage drop across a 0.5 ohm resistor carrying 10 amps of current? How large is the joule heating power in this resistor? a) 5 volts and 5 watts b) 5 volts and 50 watts c) 20 volts and 20 watts d) 20 volts and 200 watts

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