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Current Electricity Unit review

Total questions: 65

Worksheet time: 57mins

Name
Class
Date
1.
An example of a conductor is :
a)
a glass paperweight
b)
a plastic cap
c)
a metal screw
d)
a wooden handle
2.

A 4000-Ω resistor is connected across a 220-V power source. What current will flow through the resistor?

a)

0.055 A

b)

1.8 A

c)

5.5 A

d)

18 A

3.

What potential difference is required across an 8.0-Ω resistor to cause 2.0 A to flow through it?

a)

4.0 V

b)

16 V

c)

8.0 V

d)

32 V

4.

Which unit is used to measure electric current?

a)

Volt

b)

Ohm

c)

Ampere

d)

Watt

5.

If a circuit has a voltage of 9 volts and a resistance of 3 ohms, what is the current flowing through the circuit?

a)

3 amperes

b)

27 amperes

c)

0.33 amperes

d)

12 amperes

6.

If a lightbulb has 1.0 A flowing through it, how many electrons will pass through the filament in 1.0 s?

a)

6.242 x 10^18 electrons

b)

8.75 x 10^18 electrons

c)

12.75 x 10^18 electrons

d)

10.5 x 10^18 electrons

7.
if resistance of a circuit is tripled, and the voltage stays the same, the current will_
a)
double
b)
decrease by one third
c)
triple as will
d)
not change
8.

What specifically does resistance reduce the flow of?

a)

Current

b)

Voltage

c)

Electricity

9.

Which of these correctly shows Ohm's law?

a)

V = IR

b)

V = I ÷ R

c)

V = CR

10.

If a current of 10 amperes flows through a 230 volt lamp, what is its resistance?

a)

2300 ohms

b)

23 ohms

c)

23 ohms

11.
What is the wattage rating of a 240 volt, 6 amp device?
a)
1.44
b)
14.4
c)
144
d)
1440
12.
Which of the following is NOT a good insulator?
a)
rubber
b)
wood
c)
iron
d)
plastic
13.
Potential difference is another term for
a)
current
b)
voltage
c)
energy
d)
watts
14.
what is the power of a lamp whose current is 6 A and the voltage across it is 120 V?
a)
120 W
b)
720 W
c)
16 W
d)
10 W
15.
Define electric current. 
a)
It is the work done by the source in driving charges around a complete circuit.
b)
It is a measure of the rate of flow of electric charge through a given cross-section of a conductor.
c)
It is the work done by the source in driving a unit charge around a complete circuit.
d)
It is a measure of the flow of electric charge through a given cross-section of a conductor.
16.

What do the arrows in the circuit represents?

a)

conventional current

b)

eletromotive force

c)

electron flow

d)

voltage

17.
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
18.
If the voltage stays the same and resistance is increased, current will ________. 
a)
Increase
b)
Decrease
c)
Stay the same
d)
Not enough info
19.
Determine the resistance of the light bulb.
a)
0.25 Ω
b)
1 Ω
c)
2 Ω
d)
4 Ω
20.

the following factors affect resistance of conductor. which one does not

a)

temperature

b)

length of the conductor

c)

diameter of the wire

d)

surface area of the conductor

21.
Which copper wire has the lowest resistance?
a)

1 metre of 1 mm diameter wire

b)

0.5 metre of 1 mm diameter wire

c)

0.5 metre of 0.5 mm diameter wire

d)

1 metre of 0.5 mm diameter wire

22.
which has the highest current flowing through it?
a)
R1
b)
R2
c)
R3
d)
All the same
23.
What 1 kW is equivalent to __________ watts?
a)
100 W
b)
1,000 W
c)
10,000 W
d)
10 W
24.
Resistance is measured in what unit?
a)
ohms
b)
amps
c)
watts
d)
volts
25.
Power is measured in what unit?
a)
amps
b)
volts
c)
watts
d)
ohms
26.
What does the Greek letter Ω,  (i.e. Omega) represent?
a)
amps
b)
volts
c)
watts
d)
ohms
27.
Material, length, diameter, and temperature all determine the ______ of a wire.
a)
Resistance
b)
Circuit
c)
Volts
d)
Amps
28.

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

29.

What is the power consumed by a lamp whose current is 6.0 A and the lamp has a resistance of 4.0 ohms?

a)

144 W

b)

120 W

c)

24 W

d)

1.5 W

30.

According to Ohm's Law, what is the relationship between current and potential difference?

a)

No Relationship

b)

Directly Proportional

c)

Exponential Relationship

d)

Inversely Proportional

31.

What is the flow of electric charges called?

a)

Voltage

b)

Resistance

c)

Electric Current

d)

Power

32.

Which type of circuit has more than one pathway?

a)
Series Circuit 
b)
Parallel Circuit 
33.

Calculate total current in a parallel circuit with an 18 V battery, a 200 ohm resistor and a 350 ohm resistor.

a)

0.14 A

b)

0.0079 A

c)

127.24 A

d)

0.033 A

34.

If resistors are parallel they have the same_______?

a)

current

b)

resistance

c)

voltage

d)

nothing

35.

If resistors are in series they have the same_______?

a)

current

b)

resistance

c)

voltage

d)

nothing

36.

Calculate the total resistance of the circuit.

a)

13 kilo-ohms

b)

0.625 kilo-ohms

c)

1.6 kilo-ohms

d)

0.077 kilo-ohms

37.

What is the same at all points in series?

a)

Current

b)

Voltage

c)

Resistance

d)

Power

38.

What is the same at all points in a Parallel Circuit?

a)

Current

b)

Voltage

c)

Resistance

d)

Power

39.

What is this formula used for? R1+R2+R3...=Rt

a)

Finding total resistance in parallel

b)

Finding total current in series

c)

Finding total resistance in series

d)

Finding total voltage in parallel

40.

What is this formula used for?

R1XR2/R1+R2=Rt

a)

Finding total resistance in any parallel circuit

b)

Finding total resistance in a parallel circuit with only two resistors

c)

Finding total resistance in a parallel circuit when all of the resistors are the same value

d)

Finding total resistance in a series circuit

41.

What does I stand for

a)

Voltage

b)

Current

c)

Resistance

d)

Power

42.

What is the total resistance if 1/R = 1/10 + 1/5?

a)

2 ohms

b)

3.33 ohms

c)

15 ohms

d)

5 ohms

43.

If a series circuit of three bulbs is rearranged into a parallel circuit, what will happen to the brightness of three bulbs

a)

The bulbs will turn off due to an incomplete supply of electricity.

b)

All three bulbs will have the same amount of luminosity once rearranged into a parallel circuit but will be dimmer than in parallel.

c)

All three bulbs will have the same amount of luminosity once rearranged into a parallel circuit but will be brighter than in parallel.

d)

The bulb next to the battery will be brightest and each bulb will be dimmer than the one before.

44.
If there is a 4 ohm resistor, 6 ohm resistor, and a 8 ohm resistor in a parallel circuit, what is the total resistance?
a)

6.43 ohms

b)

1.85 ohms

c)

0.32 ohms

d)

1.53 ohms

45.
The current going through the 45 ohm resistor is 
a)
0.05 amps
b)
0.2 amps
c)
0.1 amps
d)
5 amps
46.

Does this statement best describe a parallel or a series circuit.
 
When more light bulbs are added they all remain the same brightness. 

a)
Parallel circuit
b)
Series circuit
47.

The unit which resistance is measured is .....

a)

Volts

b)

Amps

c)

Coulombs

d)

Ohms

48.

Potential difference is another name for .......

a)

Current

b)

Resistance

c)

Voltage

d)

Charge

49.

If you increase the length of a wire then the resistance will.....

a)

decrease

b)

increase

c)

stay the same

50.

If you increase the diameter of a wire then the resistance will.....

a)

decrease

b)

increase

c)

stay the same

51.
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
52.

Solve for the total resistance of the circuit shown

a)

50 V

b)

1970 ohms

c)

705 K ohms

d)

20 Amps

53.

This circuit has only one path for current to flow

a)

series

b)

parallel

c)

combination

d)

split

54.
How do you make an electromagnet stronger?
a)
Add a motor and/or lightbulbs
b)
Add more light bulbs and/or wire coils
c)
add more wire coils and/or a switch
d)
add more wire coils and/or batteries
55.
What does a resistor do? 
a)
Reduces the flow of electrons
b)
Reduce the flow of the current
c)
Increase flow of electrons
d)
Decreases the flow of electrons 
56.
What is the unit of measurement for current
a)
Ohm's
b)
Amperes
c)
Volts
57.
In an electrical circuit, what does this symbol represent?
a)
wire
b)
resistor
c)
lightbulb
d)
switch
58.

This electrical symbol represents...

a)

bulb

b)

switch

c)

motor

d)

buzzer

59.
what is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
60.
a)
Wire
b)
Battery
c)
Buzzer
d)
Fuse
61.

What does this symbol represent?

a)

Battery

b)

Circuit

c)

Load

d)

Resistor

62.

What does an ammeter measure?

a)

Current

b)

Voltage

c)

Resistance

63.

What does a voltmeter measure?

a)

Current

b)

Voltage

c)

Resistance

64.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
65.
The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?
a)
170 W
b)
170 A
c)
1.7 V
d)
1.7 W

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