Free Printable Understanding OHM's Law Quiz

1.

What is the definition of Ohm's Law?

a)

The current through a conductor between two points is directly proportional to the voltage across the two points.

b)

The resistance of a conductor is inversely proportional to its length.

c)

The power dissipated in a conductor is proportional to the square of the current.

d)

The voltage across a conductor is inversely proportional to the current through it.

2.

Which of the following is the correct formula for Ohm's Law?

a)

$V = IR$

b)

$P = IV$

c)

$R = \frac{V}{I}$

d)

$I = \frac{V}{R}$

3.

If the voltage across a resistor is 12V and the current through it is 3A, what is the resistance?

a)

2 ohms

b)

4 ohms

c)

6 ohms

d)

8 ohms

4.

Which of the following is an application of Ohm's Law?

a)

Calculating the power consumption of an electrical device.

b)

Determining the resistance of a resistor in a circuit.

c)

Measuring the capacitance of a capacitor.

d)

Finding the inductance of an inductor.

5.

If the resistance in a circuit is doubled while keeping the voltage constant, what happens to the current?

a)

It doubles.

b)

It halves.

c)

It remains the same.

d)

It quadruples.

6.

What is the unit of resistance?

a)

Volt

b)

Ampere

c)

Ohm

d)

Watt

7.

In a series circuit with a total resistance of 10 ohms and a voltage supply of 20V, what is the current flowing through the circuit?

a)

1A

b)

2A

c)

4A

d)

5A

8.

Which of the following statements is true about the relationship between voltage and current in Ohm's Law?

a)

Voltage is inversely proportional to current.

b)

Voltage is directly proportional to current.

c)

Voltage is independent of current.

d)

Voltage is equal to the square of the current.

9.

If a resistor has a resistance of 5 ohms and the current through it is 2A, what is the voltage across the resistor?

a)

5V

b)

7V

c)

10V

d)

15V

10.

Which of the following is NOT an application of Ohm's Law?

a)

Designing electrical circuits.

b)

Calculating the resistance needed for a specific current.

c)

Measuring the frequency of an AC signal.

d)

Troubleshooting electrical problems.

11.

If the voltage across a resistor is 24V and the resistance is 8 ohms, what is the current through the resistor?

a)

2A

b)

3A

c)

4A

d)

6A

12.

What happens to the resistance if the length of a conductor is increased, assuming all other factors remain constant?

a)

Resistance decreases.

b)

Resistance increases.

c)

Resistance remains the same.

d)

Resistance becomes zero.

13.

In a parallel circuit, if one branch has a resistance of 10 ohms and another branch has a resistance of 20 ohms, what is the total resistance?

a)

5 ohms

b)

6.67 ohms

c)

10 ohms

d)

15 ohms

14.

If the current through a resistor is 0.5A and the resistance is 10 ohms, what is the power dissipated by the resistor?

a)

2.5W

b)

5W

c)

10W

d)

20W

15.

Which of the following is a correct statement of Ohm's Law?

a)

$I = \frac{V}{R}$

b)

$R = \frac{I}{V}$

c)

$V = \frac{I}{R}$

d)

$P = IV$

16.

If a circuit has a voltage of 15V and a current of 3A, what is the resistance in the circuit?

a)

3 ohms

b)

5 ohms

c)

7 ohms

d)

10 ohms

17.

Calculate the current when the potential difference is 10V and resistance is 2Ω

a)

5mA

b)

5A

c)

20A

d)

0.2A

18.

Calculate the voltage (V):

(a)

19.

If the Voltage stays the same and Resistance is increased, Current will

a)

Increase

b)

Decrease

c)

Stay the same

d)

Not enough info

20.

How do you calculate resistance?

a)

Current x Voltage

b)

Voltage x Power

c)

Voltage ÷ Current

d)

Current ÷ Voltage

21.

What is the total resistance

a)

20V

b)

0.8Ω

c)

25Ω

d)

1.2Ω

22.

Resistance is how .....

a)

easy it is for electrons or charge to flow

b)

difficult it is for electrons or charge to flow

c)

the flow of current

d)

much energy is lost as heat

23.

How do you calculate the total resistance ( $R_{total}$ ) in a series circuit with three resistors of $2\Omega$ , $3\Omega$ , and $5\Omega$ ?

a)

$2\Omega$

b)

$5\Omega$

c)

$10\Omega$

d)

$3\Omega$

24.

If a resistor has a resistance of $8 \, \Omega$ and the voltage across it is $16 \, V$ , what is the current through the resistor?

a)

$1 \, A$

b)

$2 \, A$

c)

$4 \, A$

d)

$8 \, A$

25.

What is the total resistance of two $10 \, \Omega$ resistors connected in parallel?

a)

$5 \, \Omega$

b)

$10 \, \Omega$

c)

$15 \, \Omega$

d)

$20 \, \Omega$

26.

What is the unit of resistance?

a)

Ampere

b)

Volt

c)

Ohm

d)

Watt

27.

If a resistor has a resistance of $10 \, \Omega$ and a current of $2 \, A$ flows through it, what is the voltage across the resistor?

a)

$5 \, V$

b)

$10 \, V$

c)

$20 \, V$

d)

$40 \, V$

28.

If a circuit has a voltage of $12 \, V$ and a resistance of $4 \, \Omega$ , what is the current flowing through the circuit?

a)

$1 \, A$

b)

$2 \, A$

c)

$3 \, A$

d)

$4 \, A$

29.

In a parallel circuit, if the resistance of each resistor is $6 \, \Omega$ and there are 2 resistors, what is the total resistance?

a)

$3 \, \Omega$

b)

$6 \, \Omega$

c)

$12 \, \Omega$

d)

$2 \, \Omega$

30.

How do you calculate the total resistance in a series circuit with resistors $R_1$ , $R_2$ , and $R_3$ ?

a)

$R_{total} = R_1 + R_2 + R_3$

b)

$R_{total} = \frac{1}{\frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}}$

c)

$R_{total} = R_1 \times R_2 \times R_3$

d)

$R_{total} = \frac{R_1 + R_2 + R_3}{3}$

31.

What happens to the total resistance in a parallel circuit if more resistors are added?

a)

It increases.

b)

It decreases.

c)

It remains the same.

d)

It becomes zero.

32.

If a circuit has a voltage of $24 \, V$ and a current of $3 \, A$ , what is the resistance?

a)

$6 \, \Omega$

b)

$8 \, \Omega$

c)

$12 \, \Omega$

d)

$24 \, \Omega$

33.

The voltage of the battery is 8 volts. If the current must double but the light bulb is remaining the same, the battery must be replaced by one with ____ volts

a)

16 volts

b)

8 volts (the battery voltage won’t change)

c)

4 volts

d)

More information is needed

34.

What is the relationship between electric current and voltage in a circuit?

a)

Directly proportional

b)

Constant

c)

Unrelated

d)

Indirectly proportional

35.

How did Tesla use the equation P=IV to solve Edison's line loss problem?

a)

He increased the power and decreased the voltage

b)

He increased the voltage and decreased the current

c)

He increased the current and decreased the power

d)

He decreased the power and voltage

36.

If the Voltage is increased and the resistance stays the same, Current will

a)

Increase

b)

Decrease

c)

Stay the same

d)

Not enough info

37.

What is the power of a lamp whose current is 6A and the voltage across it is 120V?

a)

120W

b)

720W

c)

16W

d)

10W

38.

An electric bulb is connected to a 220V generator. The current is 0.50 A.

What is the power of the bulb?

a)

440W

b)

220W

c)

110W

d)

55W

39.

In the equation P=IV, what does P stand for?

a)

Power

b)

Potential

c)

Polarity

d)

Possibility

40.

In the equation P=IV, what does V stand for?

a)

Joules

b)

Volts

c)

Watts

d)

Five

41.

In the equation, P=IV, what does I stand for?

a)

Current

b)

Incandescent

c)

Impulse

d)

Insulator

42.

The two ends of a 3.0-ohm resistor are connected to a 9.0-V 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

43.

What is the power of a 3V light bulb with 20 A running through it?

a)

0.15W

b)

6W

c)

60W

d)

6.67W

44.

Watts is the same as...

a)

Joules per second

b)

Voltage per second

c)

Current per second

45.

What is the power of a 20V bulb with 5A through it?

a)

100W

b)

100V

c)

6.3W

d)

6.3A

46.

What kind of circuit would we find in a cheap strand of holiday lights, if one bulb goes out on the line they ALL go out?

a)

Parallel Circuit

b)

Series Circuit

c)

Simple Circuit

d)

Short Circuit

47.

This circuit does not work because…

a)

the bulbs are not connected properly

b)

two cells are not powerful enough

c)

there is a break in the circuit

d)

the cells are facing each other

48.

a)

Series circuit - Bulbs are lit

b)

Series circuit - Bulbs are off

c)

Parallel circuit - Bulbs are lit

d)

Parallel circuit - Bulbs are off

49.

a)

all bulbs are lit equally

b)

the two top bulbs are brighter

c)

the single lower bulb is brighter

d)

the single bulb does not light and the other two are dim

50.

a)

Bulbs are in parallel - Circuit X is brighter than Circuit Y

b)

Bulbs are in parallel - Circuit Y is brighter than Circuit X

c)

Bulbs are in series - Circuit X is brighter than Circuit Y

d)

Bulbs are in series - Circuit Y is brighter than Circuit X

51.

What is a circuit that only has ONE path for electricity to flow?

a)

series circuit

b)

closed circuit

c)

parallel circuit

d)

light bulb

52.

What type of circuit is show in the image?

a)

Series Circuit

b)

Parallel Circuit

53.

A class prepared some electrical circuits using battery, connecting wires, and three light bulbs. Which of these circuits can make the three bulbs light?

a)

A

b)

B

c)

C

d)

D

54.

When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in __________.

a)

parallel

b)

series

c)

open

d)

closed

55.

If the cell above has a potential difference of 8V, what is the potential difference across one bulb?

a)

8V

b)

4V

c)

16V

d)

2V

56.

Using the circuit shown solve for Total current flowing through the circuit (I_T)

a)

4 A

b)

3 A

c)

2 A

d)

1 A

57.

In this circuit, the bulb(s) that light up are:

a)

1 only

b)

2 only

c)

1 and 2

d)

None of them

58.

All the lightbulbs in this circuit are lit. Which change would cause all the bulbs to go out?

a)

Removing wire 1

b)

Removing wires 2 and 4

c)

Removing wires 2 and 5

d)

Removing wires 3 and 4

59.

This is an example of a _______ circuit

a)

open

b)

series

c)

parallel

d)

switch

60.

A student builds a circuit made up of a battery, two light bulbs, and a switch. What will the student most likely observe in this circuit?

a)

Light bulb 1 and light bulb 2 will both be on

b)

Light bulb 1 will be off, but light bulb 2 will be on

c)

Light bulb 1 and light bulb 2 will both be off

d)

Light bulb 1 will be on, but light bulb 2 will be off

61.

What is happening here?

a)

Series circuit - Bulbs are lit

b)

Series circuit - Bulbs are off

c)

Parallel circuit - Bulbs are lit

d)

Parallel circuit - Bulbs are off

62.

Does this diagram represent a series or parallel circuit?

a)

series circuit

b)

parallel circuit

63.

If lamp 1 is unscrewed from its holder, what will happen to lamp 2?

a)

It will get brighter

b)

It will stay the same brightness

c)

It will go out

d)

Nothing will happen

64.

The picture shows an electrical circuit. This circuit is a series circuit because:

a)

It has 3 light bulbs.

b)

The same current flows through all three light bulbs.

c)

It uses a single battery.

d)

The electrical current is divided between the three light bulbs.

65.

If lamp 2 is unscrewed from its holder, what will happen to lamp1?

a)

It will stay lit

b)

It will go out

c)

It will get dimmer

d)

It will dissapear

66.

Which one will still function if one light bulb goes out?

a)

A-Series

b)

B-Parallel

c)

A-Parallel

d)

B-Seriese

67.

The picture shows an electrical circuit. This circuit is a series circuit because:

a)

It has 3 light bulbs.

b)

The same current flows through all three light bulbs.

c)

It uses a single battery.

d)

The electrical current has more than one path to flow through

68.

What will happen if one light bulb is removed from this circuit?

a)

The other bulbs will go out.

b)

The other bulbs will stay on

c)

The other bulbs will get dimmer.

d)

The battery will become stronger.

Understanding OHM's Law Quiz

Total questions: 68

Worksheet time: 49mins

Similar Resources on Wayground