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Ohm's law

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

Potential difference is measured in:

a)

Watts

b)

Joules

c)

Ohms

d)

Volts

2.

Current is measured in:

a)

Coulombs

b)

Amps

c)

Ohms

d)

Volts

3.

The opposition to a flow of current is:

a)

Resistance

b)

Repulsion

c)

Refraction

d)

Reflection

4.

The rate of flow of charge is:

a)

Resistance

b)

Power

c)

Current

d)

Potential Difference

5.

The energy per unit charge is:

a)

Current

b)

Resistance

c)

Potential Difference

d)

Power

6.

As the resistance of a circuit increases, the current will:

a)

Decrease

b)

Increase

c)

Stay the same

7.

Which particles move through a wire to produce a current?

a)

Atoms

b)

Protons

c)

Neutrons

d)

Electrons

8.

A current of 2A flows through a resistor with a resistance of 10Ω. What is the potential difference across the resistor?

a)

5V

b)

5J

c)

20V

d)

20J

9.

A light bulb has a resistance of 7Ω with a potential difference of 21V across it. What is the current flowing through the light bulb?

a)

147 A

b)

28 A

c)

3A

d)

30A

10.

A resistor has a potential difference of 10V across it and a current of 2A flowing through it. What is the resistance of the resistor?

a)

20Ω

b)

5Ω

c)

200Ω

d)

0.2Ω

11.

A current of 5A passes through a resistor of 1kΩ. What is the potential difference across the resistor?

a)

5 V

b)

5x10-3 V

c)

5x103 V

d)

0.2 V

12.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
13.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
14.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
15.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
16.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
17.
Electricity that flows in a closed path is called a
a)
path
b)
current
c)
circuit
d)
light
18.
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
a)
25 V
b)
10 V
c)
2.5 V
d)
0.4 V
19.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
20.
Current times Resistance equals
 (I X R)
a)
Power
b)
Voltage
c)
Amperage
d)
Ohm
21.

Voltage divided by Resistance

(V / R)

a)

Current

b)

Power

c)

Ohms

d)

Watts

22.

Voltage divided by Current

(V / I)

a)

Current

b)

Power

c)

Resistance

d)

Watts

23.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
24.
If the Voltage stays the same and Resistance is increased, Current will 
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
25.
Electricity that flows in a closed path is called a
a)
path
b)
current
c)
circuit
d)
light
26.
If you decreases the resistance of a circuit, what happens?
a)
Current decreases
b)
Current increases
c)
Electrons disappear
d)
Bulbs get brighter
27.
If you increase the voltage of a circuit, what happens?
a)
Current decreases
b)
Current increases
c)
Electrons disappear
d)
Bulbs get dimmer
28.
What letter represents Current?
a)
A
b)
I
c)
R
d)
E
29.

What is not needed in order to create a working circuit?

a)

battery (power source)

b)

lightbulb

c)

current

d)

closed circuit

30.

If all of the switches were closed, how many paths can the current take?

a)

4

b)

6

c)

8

d)

10

31.
The flow of electricity requires a
a)
complete path
b)
incomplete path
c)
insulated current
d)
complex circuit
32.

If a circuit had 4 D-Cell batteries (each 1.5 V) and a lightbulb with resistance of 2 ohms, what is the current that flows through the circuit?

a)

2 A

b)

3 A

c)

6 A

d)

8 A

33.

Calculate the Resistance value in a closed circuit supplied with 110V and power consumed in the circuit is 100 watts:

a)

121 ohms

b)

1.1 ohms

c)

60.5 ohms

d)

11 ohms

34.

What is the voltage of a circuit that has a resistance of 6 kΩ and a current of 2

mA?

a)

A.

9 V

b)

B.

10 V

c)

C.

11 V

d)

D.

12 V

35.

What is the electric current if a circuit has a resistance of 100 Ω and a voltage

of 6.00 V?

a)

A.

0.0600 A

b)

B.

4.50 A

c)

C.

6.00 A

d)

D.

12.5 A

36.

How many coulombs does a 3-A current have in one second?

a)

A.

3 C

b)

B.

4 C

c)

C.

5 C

d)

D. 6 C

37.

1.

What is the electric current if a circuit has a resistance of 100 Ω and voltage of

12.0 V?

a)

A.

0.120 A

b)

B.

9.00 A

c)

C.

12.0 A

d)

D.

25.0 A

38.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
39.
What voltage is needed to cause a 5A current flow through a 2Ω resistor?
a)
10V
b)
2.5V
c)
7V
d)
0.4V
40.
What resistance is needed to cause a 50A current flow because of a 500V battery?
a)
10Ώ
b)
5Ώ
c)
2500Ώ
d)
550Ώ
41.
What component is this?
a)
LDR
b)
LED
c)
Thermistor 
d)
diode
42.
What component is this?
a)
Varibale resistor
b)
fuse
c)
Thermistor 
d)
diode
43.

This is an example of a _______ circuit

a)

open

b)

series

c)

parallel

d)

closed

44.

This is an example of a ______ circuit

a)

Series

b)

Parallel

c)

Open

d)

Closed

45.
With the engine running the charging system produces 14.5 Volts what would the current flow be if a resistance of 6 Ohms was present
a)
2.41 Ohms
b)
2.52 Ohms
c)
2.1 Ohms
d)
0.3333 Ohms
46.
If the battery produced 12.6 Volts and what would be the current flow be for a 6 Ohm resistor
a)
2.1 Amps
b)
2.4 Amps
c)
1.71 Amps
d)
15 Amps
47.
What voltage is needed to cause a 50A current flow through a 10Ω resistor?
a)
15V
b)
500V
c)
500 kV
d)
0.2V
48.
What voltage is needed to cause a 5A current flow through a 2Ω resistor?
a)
10V
b)
2.5V
c)
7V
d)
0.4V
49.
How do you calculate resistance?
a)
Voltage X Current
b)
Current ÷ Voltage
c)
Voltage ÷ Current
d)
Current X Amps
50.
How do you calculate current
a)
Resistance X Voltage
b)
Voltage X Resistance
c)
Resistance ÷ Voltage
d)
Voltage ÷ Resistance

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