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Worksheets

Direct Current

Total questions: 75

Worksheet time: 1hrs 19mins

Name
Class
Date
1.

The nucleus of an atom contains protons and?

a)

Electrons

b)

Neutrons

c)

Protons

d)

Both Protons and Neutrons

2.

Which of the materials is not a good conductor?

a)

Copper

b)

Silver

c)

Aluminum

d)

Rubber

3.
What does the 3rd band on a resistor represent?
a)
A number
b)
The Tolerance level
c)
The multiplier
d)
The electronic range
4.

Electricity is:

a)

Flowing electrons

b)

Still electrons

c)

voltage x wattage

d)

amps x watts

5.
Choose the true statement below concerning DC currents:
a)
DC stands for Direct Computing and electrons flow in multiple pathways
b)
DC stands for direct current and electrons flow in multiple directions
c)
DC stands for direct current and the electrons do not flow
d)
DC stands for direct current and the electrons flow in only one direction
6.
The symbol for voltage is: 
a)
Vo
b)
V
c)
W
d)
Amp
7.

what type of device is this?

a)

it is a transistor

b)

it is a diode

c)

it is an amplifier

d)

it is a power supply

8.

What is this?

a)

a capacitor

b)

a resistor

c)

a coil

d)

an amplifier

9.
Name this electrical component
a)
Electrolytic Capacitor
b)
Fixed Resistor
c)
Ceramic Disc Capacitor
d)
Diode
10.
Name this electrical component
a)
Ceramic Disc Capacitor
b)
Fixed Resistor
c)
Potentiometer
d)
Electrolytic Capacitor
11.
What does DC stand for?
a)
Driven Current
b)
Direct Current
c)
Driven Capacitance
d)
Direct Capacitance
12.

Our 9 volt batteries have this type of current

a)

variable

b)

indirect

c)

alternating

d)

direct

13.

The red wire coming from the battery is the

a)

neutral wire

b)

positive wire

c)

negative wire

14.

What does this schematic symbol represent?

a)

Capacitor

b)

Lamp

c)

Resistor

d)

Battery

15.

What does this schematic symbol represent?

a)

Lamp

b)

Wire

c)

Switch

d)

Resistor

16.

Series circuit

a)

Components connected one after another(1 path of flow)

b)

Components connected side by side

c)

Components connected in a short circuit

d)

Components connected in perpendicular

17.

PCB stands for...

a)

Portable Circuit Board

b)

Printed Carbon Board

c)

Printed Circuit Build

d)

Printed Circuit Board

18.
A potentiometer is also known as a ___________________
a)
knob
b)
button
c)
variable resistor
19.

Identify the electronic symbol.

a)

capacitor

b)

electrolytic capacitor

c)

battery

d)

resistor

20.

Identify the electronic symbol.

a)

Diode

b)

Photodiode

c)

Reflective diode

d)

Light Emitting Diode

21.

Identify the electronic symbol.

a)

NPN transistor

b)

Transistor

c)

PNP transistor

d)

Bipolar transistor

22.

What is the following symbol represent?

a)

Wire

b)

Resistor

c)

Battery

d)

Switch

23.

What does this symbol show

a)

Battery

b)

Power Supply

c)

Connected Wires

d)

Wires that Cross but don't connect

24.

What does this symbol show

a)

Battery

b)

Power Supply

c)

Connected Wires

d)

Wires that Cross but don't connect

25.

What symbol is this?

a)

Thermistor

b)

Fixed Resistor

c)

Potentiometer

d)

Transistor

26.

Which equation defines Ohm's Law?

a)

V=IV

b)

R=VI

c)

I=VR

d)

V=IR

27.

This is an example of

a)

Series circuit

b)

Parallel circuit

c)

Voltmeter

d)

Resistor circuit

28.

This is an example of

a)

Voltmeter circuit

b)

Series circuit

c)

Parallel circuit

d)

Resistor

29.

Direct current (DC) has electrons that

a)

Respond to large amounts of current

b)

Move in both directions

c)

Move in one direction (negative to positive)

d)

Become negative once they pass through a bulb

30.

The current at Lamp A, B and C is

a)

Different across all three lamps

b)

The total current divided by 3

c)

The same at all three lamps

d)

Greater at lamp A and then less at lamp C

31.

This is an example of a _______ circuit

a)

open

b)

series

c)

parallel

d)

square

32.

This is an example of a ______ circuit

a)

Series

b)

Parallel

c)

Open

d)

Dihexihedral

33.

The amount of energy used to move one coulomb of electrons through the circuit is its

a)

current

b)

voltage

c)

resistance

34.

The amount of "push" available to move electrons is _____

a)

Current

b)

Resistance

c)

Voltage

d)

Static Electricity

35.

The opposition to electron movement

a)

Voltage

b)

Static electricity

c)

current

d)

Resistance

36.

If you add another bulb in parallel,_____

a)

The bulbs get brighter

b)

The bulbs get dimmer

c)

The bulb brightness stays the same

d)

All the bulbs will go out

37.

If the top bulb goes out,

a)

All the bulbs go out

b)

The other bulbs get dimmer

c)

There is no effect on the other bulbs

d)

The other bulbs get brighter

38.

Devices in a parallel circuit receive

a)

equal current but different voltage

b)

equal voltage but different current

c)

equal voltage and equal current

d)

different voltage and different current

39.

Devices in a series circuit receive

a)

Equal current but different voltage

b)

Equal voltage but different current

c)

Equal voltage and equal current

d)

different voltage and different current

40.

Which of the following has the greatest resistance?

a)

long, thin wires

b)

Short, thick wires

c)

long, thick wires

d)

short, thin wires

41.

lowing has the least resistance?

a)

Long, thin wires

b)

Short, thick wires

c)

Long, thick wires

d)

Short, thin wires

42.

The wattage value for any resistor is equal to ____.

a)

I X R

b)

E/R

c)

I X E

d)

I/R

43.

This circuit has only one path for current to flow

a)

series

b)

parallel

c)

combination

d)

split

44.

The formula E2/R

a)

Voltage

b)

Current

c)

Power

d)

Resistance

45.

The formula I2 * R is used to find what?

a)

Current

b)

Voltage

c)

Resistance

d)

Power

46.

__________ remains the same in a series circuit.

a)

Resistance

b)

Voltage

c)

Current

d)

Power

47.
The total resistance in this circuit is 
a)
100 ohms
b)
450 ohms
c)
400 ohms
d)
30 ohms
48.
As resistors are added in series to a circuit, the total resistance will...
a)
increase
b)
decrease
c)
stay the same
49.
As the resistance of a circuit increases, the current will...
a)
increase
b)
decrease
c)
stay the same
50.
In a parallel circuit which of the following is the same value throughout the circuit?
a)
Voltage
b)
Current
c)
Resistance
d)
Charge
51.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
52.
What kind of circuit is this?
a)
series
b)
parallel
53.
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
54.
what is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
55.
Does this statement best describe a parallel or a series circuit.
 
When more light bulbs are added they all remain bright. 
a)
Parallel circuit
b)
Series circuit
56.
This circuit does not work because…
a)
the bulbs are not connected properly
b)
the single cell is not powerful enough
c)
there is a break in the circuit
d)
there is a short crcuit
57.
a)
X = OFF
Y = OFF
b)
X = ON
Y = OFF
c)
X = OFF
Y = ON
d)
X = ON
Y = ON
58.
Inductors are not found in ____.
a)
Optocouplers
b)
Motors
c)
Relays
d)
Generators
59.
An inductor ____. 
a)
All of the above
b)
Provides a specific value of inductance
c)
Opposes any change in current
d)
Stores energy in a magnetic field
60.
a)
b)
c)
d)
61.
a)
b)
c)
d)
62.
a)
b)
c)
d)
63.
a)
b)
c)
d)
64.
a)
b)
c)
d)
65.
a)

Battery

b)

Capacitor

c)

Resistor

d)

Inductor

66.

...... is just a coil of wire.

a)

resistor

b)

inductor

c)

capacitor

d)

transistor

67.
The opposition to current flow presented by capacitors and inductors is called:
a)
Resistance
b)
Reactance
c)
Impedance
d)
Reluctance
68.
The capacitance of a parallel-plate capacitor can be increased by: 
a)
increasing the charge 
b)
decreasing the charge 
c)
increasing the plate separation
d)
decreasing the plate separation 
69.
------------------------ is created out of two metal plates and an insulating material called a dielectric.
a)
An inductor
b)
A capacitor
c)
A fixed resistor
d)
A variable resistor
70.
In the capacitor, the dielectric can be made out of all sorts of ---------- materials and the plates are made of a -------------- material.
a)
conductive, insulating 
b)
conductive, conductive
c)
insulating, conductive
d)
insulating, insulating
71.

When 3 capacitors are arranged in series , the equivalent capacitance C is

a)

Ceq = C1 + C2 + C3

b)

1/Ceq = 1/C1 + 1/C2 + 1/C3

c)

Ceq = QV1 + QV2 + QV3

d)

Ceq = CR1 + CR2 + CR3

72.

When 3 capacitors are arranged in parallel , the equivalent capacitance is

a)

Ceq = C1 + C2 + C3

b)

Ceq = 1/C1 + 1/C2 + 1/C3

c)

C = QV1 + QV2 + QV3

d)

1/Ceq = 1/C1 + 1/C2 + 1/C3

73.

Capacitor stores _______________

a)

Charge

b)

Voltage

c)

Energy

d)

Money.. Lots of money

74.

Charge is measured in_________

a)

Coulombs

b)

Farads

c)

Hz

d)

Volts

75.

Capacitance is measured in___________

a)

Coulombs

b)

Farads

c)

Hz

d)

Volts

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