Ohm's Law Problems

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Question 1 (2.5 points) Question 1 Unsaved
An alarm clock draws 0.5 A of current when connected to a 120 volt circuit.
Calculate its resistance.

Question 1 options:

a)
150 ohms

b)
120 ohms

c)
60 ohms

d)
240 ohms
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Question 2 (2.5 points) Question 2 Unsaved
If one 9 volt battery is used in a circuit with a total resistance of 39 ohms, what is the current in the circuit?

Question 2 options:

a)
0.35 amps

b)
351 amps

c)
23 amps

d)
0.23 amps
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Question 3 (2.5 points) Question 3 Unsaved
A waffle iron has 12 amp current. If the resistance of the coils is 10 ohms what must the voltage be?

Question 3 options:

a)
240 volts

b)
1.2 volts

c)
120 volts

d)
12 volts
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Question 4 (2.5 points) Question 4 Unsaved
The wire in a series circuit has a resistance of 8 ohms and the light bulb in the circuit has a resistance of 14 ohms. A 66 volt battery provides energy to the entire circuit. What is the current through the entire circuit?

Question 4 options:

a)
4.71 amps

b)
8.25 amps

c)
30 amps

d)
3 amps
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Question 5 (2.5 points) Question 5 Unsaved
The break light on a car is connected to a 12-V battery. If the resulting current is 0.4 amps, what is the resistance of the brake light?

Question 5 options:

a)
30 ohms

b)
4.8 ohms

c)
5.3 ohms

d)
3 ohms
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Question 6 (2.5 points) Question 6 Unsaved
A circuit has a resistance of 30 ohms and a current of 0.05 amps, what is the voltage of the battery?

Question 6 options:

a)
15 volts

b)
12 volts

c)
9 volts

d)
1.5 volts
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Question 7 (2.5 points) Question 7 Unsaved
An electric heater works by passing a current of 100 amp though a coiled metal wire, making it red hot. If the resistance of the wire is 1.1 ohms, what voltage must be applied to it?

Question 7 options:

a)
220 volts

b)
120 volts

c)
110 volts

d)
90.9 volts
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Question 8 (2.5 points) Question 8 Unsaved
What current flows through a hair dryer plugged into a 120 Volt circuit if it has a resistance of 25 ohms?

Question 8 options:

a)
5.3 amps

b)
0.20 amps

c)
4.8 amps

d)
0.5 amps
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Question 9 (2.5 points) Question 9 Unsaved
A subwoofer needs a household voltage of 110 V to push a current of 5.5 amps through its coil. What is the resistance of the subwoofer?

Question 9 options:

a)
2.0 ohms

b)
0.05 ohms

c)
20 ohms

d)
30 ohms
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Question 10 (2.5 points) Question 10 Unsaved
If three 1.5 volt batteries are put into a flashlight and the resistance across the light bulb is 30 ohms, what is the current going through the light bulb?

Question 10 options:

a)
0.15 amps

b)
10 amps

c)
0.05 amps

d)
0.5 amps