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Dc Circuits TEST OUT

Total questions: 100

Worksheet time: 3hrs 30mins

Name
Class
Date
1.

How do you calculate resistance?

a)

Divide voltage by current

b)

Divide charge by current

c)

Multiply current by voltage

d)

Multiply voltage and current

2.

What is the resistance if the voltage is 10V and the current is 2A?

a)

20 Ω

b)

5 Ω

c)

12 Ω

d)

8 Ω

3.

What are the units for resistance?

a)

Ohms (Ω)

b)

Voltage (V)

c)

Amps (A)

d)

Charge (C)

4.
To complete a circuit the switch must be
a)
unattached
b)
open
c)
closed
5.
Which of these objects is an insulator?
a)
Copper Wire
b)
Paper Clip
c)
Steel Pole
d)
Rubber Gloves
6.
An object through which electrons can easily flow is called a(n) ___________.
a)
Conductor
b)
Insulator
7.
Electricity is the flow of _________.
a)
Protons
b)
Neutrons
c)
Electrons
8.

A current of 5.0 A flows in a resistor for 25 s. How much charge has passed through the resistor in this time?

a)

125 C

b)

5.0 C

c)

0.20 C

d)

5.0 A

9.

What is this symbol called?

a)

A. Bulb

b)

B. Resistor

c)

C. Battery

d)

D. Voltage

10.

What is this symbol?

a)

A. Ammeter

b)

B. Resistor

c)

C. Battery

d)

D. Voltage

11.

To calculate voltage, multiply _______ and _________

a)

current, resistance

b)

volts, current

c)

volts, ohms

d)

ohms, resistance

12.

A thicker wire means ____________ in resistance.

a)

a decrease

b)

an increase

c)

no change

13.

Ohm's law

a)
b)
c)
d)
14.

What is the total resistance in the circuit?

a)

10 ohms

b)

6 ohms

c)

4 ohms

d)

2.4 ohms

15.

What is the total current through the battery?

a)

0.75 A

b)

1.5 A

c)

3 A

d)

0.33 A

16.

What is the current through the 2 ohm resistor?

a)

0.75 A

b)

1.5 A

c)

3 A

d)

0.33 A

17.

Originally bulbs a, b and c are identical. If lightbulb c is replaced with a bulb of lower resistance, how does the current in c compare to the current through a or b?

a)

it is higher

b)

it is lower

c)

it is the same

d)

it has no current flowing through it

18.

What happens to light bulbs a, b and c if another light bulb "d" is added in parallel?

a)

they get brighter

b)

they get dimmer

c)

they turn off

d)

they remain the same

19.

What happens to the intensity of the lightbulbs if another lightbulb "d" is added in series?

a)

they all are brighter than before

b)

they all are dimmer than before

c)

they all turn off

d)

they all are the same brightness as before

20.

How much power is used by a calculator that operates on 8 volts and 0.1 amperes

a)

0.0125 Watts

b)

0.8 Watts

c)

0.8 Joules / second

d)

80 Watts

21.

Resistivity of a wire depends on

a)

length.

b)

material

c)

cross section area.

d)

all of the above

22.

Which one of the following graphs correctly represents Ohm’s law, where V is the voltage and I is the current?

a)
b)
c)
d)
23.

What is the equivalent resistance in the diagram?

a)

3Ω

b)

5Ω

c)

8Ω

d)

11Ω

24.
How does resistance affect current?
a)
less resistance - less current
b)
more resistance - less current
c)
more resistance - more current
d)
resistance does not affect current
25.

the formula to find current when the values of V and R are known is

a)

I = V2R

b)

I = V/R

c)

I = R/V

d)

I=VR

26.
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
27.
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
28.
The plastic covering is there to:
a)
Provide a conductor for electrical energy to flow.
b)
Provide an insulator so that electrical energy will not pass outside of the wires.
c)
Provide a conductor so that electrical energy can NOT flow.
d)
Provide an insulator so that electrical energy can flow.
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.
What is this symbol?
a)
resistor
b)
switch
c)
battery
d)
bulb
31.
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
32.

A current-carrying coil in a magnetic field experiences a turning effect.

How can the turning effect be increased?

a)

increase the number of turns on the coil

b)

reduce the size of the current

c)

reverse the direction of the magnetic field

d)

use thinner wire for the coil

33.
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.
34.
This circuit has more than one loop. When one light goes out, the others stay on. 
a)
closed circuit
b)
series circuit
c)
parallel circuit
d)
open circuit
35.
In a series circuit, if one receiver is disconnected, nothing will work.
a)
true
b)
false
36.
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.
37.
a)
Series circuit - Bulbs are lit
b)
Series circuit - Bulbs are off
c)
Parallel circuit - Bulbs are lit
d)
Parallel circuit - Bulbs are off
38.
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
39.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
40.
Current times Resistance equals
 (I X R)
a)
Power
b)
Voltage
c)
Amperage
d)
Ohm
41.

Voltage divided by Resistance

(V / R)

a)

Current

b)

Power

c)

Ohms

d)

Watts

42.
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
43.
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
44.

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

45.

Simple, Series, or Parallel?

a)

Simple

b)

Series Circuit

c)

Parallel Circuit

46.
What kind of circuit is this?
a)
series
b)
parallel
47.

If the potential difference is 12 volts and the resistance is 5 ohms, what is the current?

a)

2.4 A

b)

60 A

c)

0.417 A

d)

17 A

48.

Solve for the total resistance of the circuit shown

a)

50 V

b)

1970 ohms

c)

705 K ohms

d)

20 Amps

49.

What is the total circuit resistance of the following five resistors connected in series?

R1 = 27 ohms

R2 = 33 ohms

R3 = 51 ohms

R4 = 1.2 kohms

R5 = 240 ohms

Rt = __________ Ohms

a)

353.2

b)

1551

c)

1.9 K

50.

What is the current passing through this circuit?

a)

0.5 A

b)

0.05 A

c)

0.005 A

d)

0.0005

51.
a)

The magnets will attract each other.

b)

The magnets will repel each other.

c)

The Magnets will Create a Voltage

d)

The magnets will start to spin and create a AC Wavform

52.

Which contacts are used to power up the coil?

a)

1 and 8

b)

1 and 4

c)

2 and 10

d)

8 and 6

53.

This control relay has _______ pins

a)

9

b)

8

c)

10

d)

11

54.

How many contacts does Control Relay 1 have in this circuit?

a)

1

b)

2

c)

3

d)

4

55.

How many NC contacts does this relay have?

a)

1

b)

2

c)

3

d)

4

56.

Which rung is Control Relay 1's NC contacts on?

a)

1

b)

2

c)

3

d)

4

57.

This is a picture of a ________________ switch

a)

3 Pole Single Throw

b)

2 Pole Double Throw

c)

3 Pole Double Throw

d)

2 Pole Single Throw

58.

This is an example of cube relay with __________ terminals

a)

Tab

b)

Screw

c)

Pin

d)

Push

59.

If I wanted to utilize one set of NO contacts on this relay which two contact numbers could I use?

a)

1 and 4

b)

8 and 6

c)

1 and 7

d)

8 and 5

60.

How many NO contacts does CR1 have in this circuit?

a)

1

b)

2

c)

3

d)

4

61.

This control Relay has 3 sets of NC contacts, the Pins for these contacts are

a)

6,7, & 1,3, & 9, 11

b)

5,6, & 1,4, & 8,11

c)

1,2, & 3,4, & 5,6

d)

1,4, & 8,11, & 6,7

62.

Control Relay 1 is located on what Rung?

a)

1

b)

3

c)

5

d)

6

63.

This is an example of a ___________ Switch

a)

Double Pole Double Throw

b)

Double Pole Single Throw

c)

3 Pole Double Throw

d)

Single Pole Double Throw

64.

Protective relays can be designed to respond to ___________

a)

Light intensity, impedance

b)

Temperature, resistance, reactance

c)

Voltage and current

d)

All of these

65.

A relay is used to

a)

Break the fault current

b)

Sense the fault

c)

Sense the fault and direct to trip the circuit breaker

d)

All of these

66.

A relay is a

a)

mechanical switch

b)

electronic switch

c)

electromechanical switch

d)

all of the above

67.

For a relay having SPDT contact, when the relay coil is energized the

a)

NC will become NO

b)

NC contact will close

c)

NO will become NC

d)

NO contact will close

68.

Identify the symbol shown by the image?

a)

Normally Closed Contact

b)

Normally Open Contact

c)

Relay Coil

d)

Normally open pushbutton

69.

Identify the symbol shown by the image?

a)

Normally Closed Contact

b)

Normally Open Contact

c)

Relay Coil

d)

Normally open pushbutton

70.

This type of program is called ?

a)

logic

b)

ladder

c)

code

d)

circuit

71.

Is an electrically operated switch. Current flowing through the coil creates a magnetic field, which attracts a lever and changes the switch contacts.

a)

Normally open pushbutton

b)

Normally closed pushbutton

c)

Relay

d)

Emergency switch

72.
This is an example of a _______ circuit
a)
open
b)
series
c)
parallel
d)
square
73.
This is an example of a ______ circuit
a)
Series
b)
Parallel
c)
Open
d)
Dihexihedral
74.
The total resistance in this circuit is 
a)
100 ohms
b)
450 ohms
c)
400 ohms
d)
30 ohms
75.

What is the total resistance (RT) across this circuit?

a)

3 kΩ

b)

10 kΩ

c)

13 kΩ

d)

18 kΩ

76.

If the resistor R1 in the circuit of figure 1 were to open circuit, the circuit current would ?

a)

a. remain unchanged.

b)

b. decrease.

c)

c. increase.

d)

d. become zero.

77.

If the resistor R3 in the circuit of figure 1 were to short circuit, the circuit current would:

?

a)

a. remain unchanged.

b)

b. decrease.

c)

c. increase.

d)

d. become zero.

78.

If the resistance of the resistor R1 in the circuit of figure 1 was to be increased, the equivalent resistance of the circuit would ?

a)

a. increase.

b)

b. decrease to zero.

c)

c. decrease to a lower value.

d)

d. increase to a much higher value.

79.

If an extra resistor was added in parallel with resistors R2 and R3 in the circuit of figure 1, the equivalent circuit resistance would ?

a)

a. increase.

b)

b. decrease to zero.

c)

c. decrease to a lower value.

d)

d. increase to a much higher value.

80.
In a parallel circuit which of the following is the same value throughout the circuit?
a)
Voltage
b)
Current
c)
Resistance
d)
Charge
81.

Solve for total current that is flowing through the circuit shown

a)

2 A

b)

154 mA

c)

154 A

d)

77 mA

82.

What is the voltage drop over the 2 ohm resistor?

a)

6 V

b)

3 V

c)

2 V

d)

1 V

83.

In the circuit of figure 1, the supply current is equal to the ?

a)

a. value of branch currents.

b)

b. product of the branch currents.

c)

c. sum of the currents in each resistor.

d)

d. sum of the branch currents

84.

What does the electronic schematic symbol shown represent?

a)

an AC current source

b)

a DC current source

c)

an ammeter

d)

a voltmeter

85.

What is the total current through the battery?

a)

0.75 A

b)

1.5 A

c)

3 A

d)

0.33 A

86.
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.
87.

If resistor R1 in the circuit of figure 1 was short circuited, the circuit power dissipation would ?

a)

a. remain unchanged.

b)

b. decrease.

c)

c. increase.

d)

d. become zero.

88.
A device that contains a thin strip of metal that melts easily if the current in the circuit is too high
a)
Fuses
b)
Circuit
c)
Series circuit
d)
Circuit breaker
89.
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
90.

The power dissipation of any circuit ?

a)

a. equal to the sum of the power dissipation of each resistor.

b)

b. equal to the product of the power dissipation of each resistor.

c)

c. equal to the supply voltage squared times the circuit equivalent resistance.

d)

d. depends on the circuit arrangement.   

91.

When three 10Ω resistors are connected in parallel,

the voltage drop across each is ?

a)

a. one third of the supply voltage

b)

b. supply voltage divided by 10 .

c)

c. equal to the supply voltage

d)

d. supply voltage divided by 30.

92.
The type of current where charges flow in one direction
a)
Direct Current
b)
Alternating Current
c)
Electron Flow
d)
Voltage
93.

If one resistor in a parallel circuit of three resistors becomes short circuited,

the circuit current will ?

a)

a. remain constant

b)

b. decrease to zero

c)

c. decrease by the value of current in the shorted branch

d)

d. increase to a large value

94.

What does the electronic schematic symbol shown represent?

a)

Battery

b)

Inductor

c)

Resistor

d)

Capacitor

95.
The type of current where charges flow in one direction
a)
Direct Current
b)
Alternating Current
c)
Electron Flow
d)
Voltage
96.

If one resistor in the parallel section of a series-parallel circuit goes open circuit, the circuit power dissipation will ?

a)

a. remain constant.

b)

b. decrease.

c)

. c. increase.

d)

d. decrease to zero.

97.

What does the electronic schematic symbol shown represent?

a)

light bulb

b)

cell

c)

battery

d)

resistor

98.
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.
99.

Solve for the current flowing through R2.

a)

10.3 ma

b)

28.3 ma

c)

16.4 ma

d)

8.3 ma

100.
A device that contains a thin strip of metal that melts easily if the current in the circuit is too high
a)
Fuses
b)
Circuit
c)
Series circuit
d)
Circuit breaker

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