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Problems with solutions

I.D Level Problem Problem Topic
507 High school A metal wire has a resistance of 25.00 ohm . Under room temperature conditions of 25 degreeC when the wire is heated to 85 degreeC the resistance increases by 0.75 ohm . What is the temperature coefficient of resistivity of this metal ?

a. 5.0 x 10-4(degreeC)-1

b. 1.3 x 10-3(degreeC)-1

c. 1.5 x 10-3(degreeC)-1

. . . continues
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Current & Electricity
508 High school A tungsten wire is used to determine the melting point of indium . The resistance of the tungsten wire is 3.000 ohm at 20 dgreeC and increases to 4.850 ohm as the indium starts to melt tungsten = 4.50 x 10- 3 (degreeC) -1. What s the melting temperature of indium ?

a. 132 degreeC

b. 157 degreeC

c. 351 degreeC

< . . . continues
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Current & Electricity
509 High school The temperature coefficient of resistivity for a “perfect” ohmic material would be .

a. positive and constant.

b. zero .

c. negative .

d. positive and uniformly increasing .

. . . continues
Solution:
(a) positive and constant
Current & Electricity
510 High school A steam turbine at an electric power plant delivers 4500 kW of power to an electrical generator which converts 95% of this mechanical energy into electrical energy . What is the current delivered by the generator if it delivers at 3600 V

a. 0.66 x 103 A

b. 1.0 x 103 A

c. 1.2 x 103 A

d. 5.9 x 103 A

. . . continues
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Current & Electricity
511 High school The heating coil of a water heater has a resistance of 20 ohm and operate sat 210 V . How long a time is required to raise the temperature of 200 kg of water from 15 degreeC to 80 degreeC ? ( The specific heat for water = 103 cal/kg. degreeC and 1.0 cal = 4.186 J .)

a. 1.7 h

b. 3.8 h

c. 5.1 h

d. 6.9 h

. . . continues
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Current & Electricity
512 High school An 8.00 ohm resistor is dissipating 100 watts . What are the current through it , and the difference of potential across it ?

a. 12.5 A, 28.3 V

b. 3.54 A, 12.5 V

c. 3.54 A, 28.36V

d. 28.3 A, 3.54 V

. . . continues
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Current & Electricity
513 High school The two ends of a 3.0 ohm resistor are connected to a 9.0V battery . What is the total power delivered by the battery to the circuit ?

a. 3.0 W

b. 27 W

c. 0.33 W

d. 0.11 W

. . . continues
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Current & Electricity
514 High school When a 24.0 ohm resistor is connected across a 12.0 V battery , a currenof 482 mA flows . What is the resulting terminal voltage of the battery ?

a. 0.4 V

b. 5.8 V

c. 11.6 V

d. 12.0 V

. . . continues
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Current & Electricity
515 High school When a 24.0 ohm resistor is connected across a 12.0 V battery , a currenof 482 mA flows . What is the resulting terminal voltage of the battery ?

a. 0.4 V

b. 5.8 V

c. 11.6 V

d. 12.0 V

. . . continues
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Uknown
516 High school As shown in the figure at “click here’ which resistor is in series with resistor R ?

a. R1

b. R2

c. R3

d.R4

. . . continues
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Current & Electricity
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