MAGNETIC CIRCUIT QUIZ

What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?

8.2 k

820

82

8.2

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The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately

18

11.2

112

1.2

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How much resistance is needed to draw 17.6 mA from a 12 volt source?

6.8 k

68

212

680

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How much resistance is required to limit the current from a 12 V battery to 3.6 mA?

3.3 k

22 k

2.2 k

33 k

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Four amperes of current are measured through a 24 resistor connected across a voltage source. How much voltage does the source produce?

9.6 V

960 V

8 V

96 V

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An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately

385

3.1

31

38.5

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If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?

8 V

32 V

3.2 V

320 V

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When there is 12 mA of current through a 1.2 k resistor, the voltage across the resistor is

10 V

14.4 V

1.4 V

100 V

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How much voltage is needed to produce 2.5 A of current through a 200 resistor?

50 V

8 V

500 V

80 V

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Approximately how much current flows through a 3.3 M resistor across a 30 V source?

9 A

900 A

90 A

9000 A

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