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Electric current, voltage and ohms law

Total questions: 62

Worksheet time: 1hrs 1mins

Name
Class
Date
1.

An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance.

a)

240 Ohms

b)

60 Ohms

c)

1240\frac{1}{240} Ohms

d)

180 Ohms

2.

A circuit consists of a 12 V battery connected across a single resistor. If the current in the circuit is 3 A, calculate the size of the resistor.

a)

36 ohms

b)

0.25 ohms

c)

4 ohms

d)

12 ohms

3.

In a stereo amplifier circuit, there is a resistor across which you measure 25V, and your ammeter indicates 50mA of current through the resistor. What is the resistor’s value in kilohms? In ohms?

a)

2kΩ, 20Ω

b)

0.5kΩ, 500Ω

c)

1.25kΩ, 1250Ω

d)

None of the above

4.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
5.

What is the current in a circuit with 6 ohms of resistance and a battery containing 24 Volts?

a)

1/4 A

b)

144 A

c)

4 A

d)

0.4 A

6.

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

a)

12 V

b)

21 V

c)

4/3 V

d)

3/4 V

7.

Longer wires have _______ resistance than shorter wires.

a)

more

b)

less

c)

the same

8.

If a cell provides 12 V to a circuit and 4 Coulombs of charge flows. How much energy is being provided by the cell?

a)

3 J

b)

0.25 J

c)

48 J

d)

16 J

9.

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

a)

12 V

b)

21 V

c)

4/3 V

d)

3/4 V

10.
What word means how much energy is given to / removed from the electrons.
a)
Current
b)
Voltage
c)
Resistance
d)
Power
11.
What resistance is needed to cause a 20A current flow because of a 100V battery?
a)
0.2Ώ
b)
2000Ώ
c)
120Ώ
d)
5Ώ
12.
What resistance is needed to cause a 50A current flow because of a 500V battery?
a)
10Ώ
b)
5Ώ
c)
2500Ώ
d)
550Ώ
13.
What voltage is needed to cause a 50A current flow through a 10Ω resistor?
a)
15V
b)
500V
c)
500 kV
d)
0.2V
14.
How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor
a)
12 volts
b)
24 volts
c)
1.3333
d)
48 volts
15.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
16.

If the battery produced 12.6 Volts what would be the current flow for a 6 Ohm resistor?

a)

2.1 Amps

b)

2.4 Amps

c)

1.71 Amps

d)

15 Amps

17.

What unit is used to measure the voltage?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

18.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
19.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
20.
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
21.

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

a)

12 V

b)

21 V

c)

4/3 V

d)

3/4 V

22.

What is the resistance of a lightbulb that experiences 9 Volts and 3 amps of current?

a)

1/3 ohms

b)

3 ohms

c)

27 ohms

d)

9 ohms

23.

What is the formula for ohms law?

a)

1+2=3

b)

R X E = I

c)

E =I x R

d)

E= MC squared

24.
What would the circuit resistance be if a 7.5 Amp draw was present with the engine running and the charging system producing 15 Volts
a)
15 Ohms
b)
4 Ohms
c)
0.3333 Ohms
d)
2 Ohms
25.
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
26.
How many Volts would it take to push 1 Amp through a resistance of 1 Ohm
a)
10 volts
b)
1 volt
c)
48 volts
d)
5 volts
27.
To complete a circuit the switch must be
a)
unattached
b)
open
c)
closed
d)
It depends
28.
What word means how hard it is for electrons to flow through.
a)
Current
b)
Voltage
c)
Resistance
d)
Power
29.
This circuit has a 24 volt battery and the resistor is 8 ohms. How many amps are running through the circuit?
a)
3 Amps
b)
192 Amps
c)
2 Amps
d)
4 Amps
30.
How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor
a)
12 volts
b)
24 volts
c)
1.3333
d)
48 volts
31.
If the Voltage stays the same and Resistance is increased, Current will 
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
32.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
33.

Voltage divided by Resistance

(V / R)

a)

Current

b)

Power

c)

Ohms

d)

Watts

34.
Current times Resistance equals
 (I X R)
a)
Power
b)
Voltage
c)
Amperage
d)
Ohm
35.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
36.
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
37.
Electricity that flows in a closed path is called a
a)
path
b)
current
c)
circuit
d)
light
38.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
39.
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
40.

The potential difference across a 5 kΩ is 12 V. Find the current flowing through the resistor

a)

60 mA

b)

2.4 mA

c)

1.7 mA

d)

0.998 mA

41.

Two parallel resistors both having their values 28 ohms are connected in parallel. The overall current provided by the 28 V source is.

a)

1 A

b)

2 A

c)

4 A

d)

8 A

42.

Two resistors having values 5 ohms and 10 ohms are connected in series to a 10 V source. Find the current flowing through the circuit:

a)

0.66 A

b)

1.5 A

c)

2 A

d)

2.5 A

43.

10) If you increase the size of the resistor and keep the voltage the same, what will happen to the current?

a)

The current will decrease

b)

The current will increase

c)

The current will stay the same

44.

The circuit with higher resistance will allow less charge to flow, meaning the circuit with higher resistance has less current flowing through it.

a)

True

b)

False

45.

If there are 40 Volts and 5 Amps running through an electrical circuit, what is the resistance of the circuit?

a)

1 Ohm

b)

2 Ohms

c)

4 Ohms

d)

6 Ohms

e)

8 Ohms

46.

What is the Voltage, V in the circuit shown?

a)

6.5 V

b)

26 V

c)

0.15 V

47.

If the current in an electrical circuit is constant, what will happen to the voltage if the resistance is increased?

a)

The voltage will decrease

b)

The voltage will increase

c)

The voltage will stay the same

48.

According to Ohm's Law, current equals the voltage divided by the _________.

a)

Resistance

b)

Inductance

c)

Capacitance

d)

Power

e)

Conductance

49.

Define Ohm’s Law

a)

a law stating that electric current is proportional to voltage and inversely proportional to resistance.

b)

a law stating that electric current is proportional to resistance and inversely proportional to voltage.

50.

In order to electrical current to flow through a wire the wire must be connected in a ____________ that includes a source of electrical current.

a)

averager matter

b)

Complete loop

c)

In an incomplete loop

d)

Interrupted Circuit

51.

What would happen if in a circuit, the resistance increases but the voltage stays the same?

a)

The current would decrease

b)

The current would increase

c)

The voltage would decrease

d)

The voltage would increase

52.

What would happen if in a circuit the voltage is increase?

a)

The time would increase

b)

The current would increase

c)

The current would decrease

d)

The current would stay the same

53.

Is the unit of resistance.

a)

Om

b)

Ohm

c)

OMS

d)

WHO

54.

is a material that has almost zero resistance when cooled down to low temperatures.

a)

Megaconductor

b)

Superconductor

c)

Omegaonductor

d)

Epsilonconductor

55.

A materials thickness, length and temperature affects its .....

a)

Current

b)

Resistance

c)

Voltage

d)

Time

56.

is the opposition to the flow of charges in a material.

a)

Resistance

b)

Voltage

c)

Time

d)

Current

57.

is a material in which charge cannot flow easily.

a)

Electrical insulator

b)

Electrical conductor

c)

Thermal conductor

d)

Therml insulator

58.

is a material in which electricity can flow easily.

a)

Thermal insulator

b)

Thermal conductor

c)

Electrical conductor

d)

Electrical insulator

59.

is a flow of electric charge that regularly

reverses its direction.

a)

Alternating current

b)

Active current

c)

Direct current

d)

Passive current

60.

Is a charge that flows only in one direction.

a)

Passive current

b)

Active current

c)

Direct current

d)

Alternating current

61.

Are the two kinds of current.

a)

Direct and alternating

b)

Direct and Passive

c)

Direct and Active

d)

Active and Passive

62.

Is defined as a continuous flow of electrons.

a)

Resistance

b)

Electric Current

c)

Ohms

d)

Voltage

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