Ohms Law Online Exam Quiz

Important questions about Ohms Law. Ohms Law MCQ questions with answers. Ohms Law exam questions and answers for students and interviews.

1. When 12 V are applied across a 68 ? resistor, the current is

Options

A : 816 mA

B : 17.6 mA

C : 176 mA

D : 8.16 mA

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

Options

A : 9 µA

B : 90 µA

C : 900 µA

D : 9000 µA

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

Options

A : 50 V

B : 500 V

C : 80 V

D : 8 V

4. Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 k? of resistance?

Options

A : 27.2 mA

B : 59 mA

C : 5.9 mA

D : 590 mA

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

Options

A : 3.3 k?

B : 33 k?

C : 2.2 k?

D : 22 k?

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

Options

A : 212 ?

B : 6.8 k?

C : 68 ?

D : 680 ?

7. Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?

Options

A : 4 ?

B : 400 ?

C : 4 k?

D : 4.4 ?

8. You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?

Options

A : 9 V

B : 900 mV

C : 0 V

D : 18 V

9. What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing?

Options

A : 183 ?

B : 18.3 ?

C : 66 ?

D : 6.6 ?

10. How much current is produced by a voltage of 18 kV across a 15 k? resistance?

Options

A : 1.2 A

B : 12 A

C : 120 mA

D : 12 mA

1. If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is

Options

A : 220 k?

B : 22 k?

C : 2.2 k?

D : 220 ?

2. A resistance of 3.3 M? is connected across a 500 V source. The resulting current is approximately

Options

A : 15.1 µA

B : 151 µA

C : 66 mA

D : 660 mA

3. 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?

Options

A : 8 V

B : 320 V

C : 3.2 V

D : 32 V

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

Options

A : 385 ?

B : 38.5 ?

C : 3.1 ?

D : 31 ?

5. A current of 200 µA through a 6.8 k? resistor produces a voltage drop of

Options

A : 34.4 V

B : 340 V

C : 13.6 V

D : 1.36 V

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

Options

A : 8.2 k?

B : 820 ?

C : 8.2 ?

D : 82 ?

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

Options

A : 14.4 V

B : 1.4 V

C : 100 V

D : 10 V

3. A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.

Options

A : 40 ?

B : 4 ?

C : 2 ?

D : 20 ?

4. What is the voltage source for a circuit carrying 2 A of current through a 36 ? resistor?

Options

A : 1.8 V

B : 18 V

C : 7.2 V

D : 72 V

5. The formula to find I when the values of V and R are known is

Options

A : I = VR

B : I = R/V

C : V = IR

D : I = V/R

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