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20 Electric Power

Total questions: 90

Worksheet time: 45mins

Name
Class
Date
1.

The principles of electric wiring and wiring terminology include:

a)

Safety, proper insulation, correct wire sizing, and clear labeling

b)

Only using the cheapest materials available

c)

Ignoring color codes and wire sizes

d)

Connecting wires without insulation or labeling

2.

Electricity is defined by which of the following terms and principles?

a)

Flow of electric charge, voltage, current, and resistance

b)

Photosynthesis, respiration, and transpiration

c)

Gravity, inertia, and momentum

d)

Evaporation, condensation, and precipitation

3.

Estimating electric needs and loads involves which of the following methods?

a)

Calculating the total wattage of all devices and applying demand factors

b)

Guessing based on previous bills

c)

Using only the number of outlets in a building

d)

Assuming all devices run at maximum capacity all the time

4.

The principles of alternating current (AC) and direct current (DC) involve differences in the direction of current flow. Which statement correctly describes this difference?

a)

AC changes direction periodically, while DC flows in one direction only.

b)

AC flows in one direction only, while DC changes direction periodically.

c)

Both AC and DC change direction periodically.

d)

Both AC and DC flow in one direction only.

5.

The sources of electric power are:

a)

Fossil fuels, nuclear energy, hydroelectric power, and renewable sources

b)

Only fossil fuels

c)

Only solar energy

d)

Only wind energy

6.

Which of the following are examples of alternative power systems?

a)

Solar and wind

b)

Coal and oil

c)

Natural gas and diesel

d)

Nuclear and gasoline

7.

Demonstrate the use of various meters designed to help people work safely around electricity.

a)

By using devices such as voltmeters, ammeters, and insulation testers to check electrical parameters and ensure safety.

b)

By only relying on visual inspection of electrical equipment.

c)

By using meters only after an accident has occurred.

d)

By avoiding the use of any meters when working with electricity.

8.

Electricity is energy that consists of charged particles, such as ________.

a)

electrons

b)

neutrons

c)

photons

d)

protons

9.

When a charge builds up in one place, it is known as ________.

a)

static electricity

b)

current electricity

c)

magnetic field

d)

thermal energy

10.

When electricity flows along a path, it is called ________.

a)

electric current

b)

electric charge

c)

electric field

d)

electric resistance

11.

Electric current is the flow of ________.

a)

electrons

b)

protons

c)

neutrons

d)

atoms

12.

In agriculture, tools and equipment convert the power of electricity into which of the following?

a)

Light

b)

Heat

c)

Sound

d)

Mechanical motion

e)

All of the above

13.

Which of the following is NOT a form that electricity is converted into in agriculture?

a)

Light

b)

Heat

c)

Water

d)

Sound

14.

What are conductors?

a)

Materials that do not allow electrons to flow

b)

Materials that readily allow electrons to flow

c)

Materials that only allow heat to flow

d)

Materials that block electricity

15.

Which of the following metals is most commonly used for electrical service?

a)

Gold

b)

Silver

c)

Aluminum

d)

Copper

16.

Fill in the blank: Gold, silver, aluminum, and ______ all conduct electricity.

a)

copper

b)

plastic

c)

wood

d)

glass

17.

In a conductor, electrons move from one atom to the next at approximately the speed of ______.

a)

light

b)

sound

c)

a car

d)

a snail

18.

The movement of electrons from one atom to the next constitutes electric current.

a)

True

b)

False

19.

What happens to an electron in a conductor?

a)

It stays in one atom

b)

It moves from one atom to the next until it leaves the conductor at the other end

c)

It disappears

d)

It moves in circles

20.

What are insulators?

a)

Materials that allow the flow of electrons

b)

Materials that resist or stop the flow of electrons

c)

Materials that generate electricity

d)

Materials that conduct heat

21.

Which of the following is NOT a common insulator?

a)

Glass

b)

Porcelain

c)

Rubber

d)

Copper

22.

Fill in the blank: Insulators are used to ______ conductors to restrict the flow of current to intended circuits.

a)

cover

b)

heat

c)

charge

d)

move

23.

Fill in the blank: Insulators help prevent unintentional human contact with ______ conductors.

a)

energized

b)

neutral

c)

plastic

d)

insulated

24.

The valence electrons of insulators are held much more tightly to the nucleus of the atoms than those of conductors.

a)

True

b)

False

25.

Which of the following is a property of single valence electrons of metal atoms?

a)

Have relatively weak bonds

b)

Are held tightly to the nucleus

c)

Cannot move from one atom to another

d)

Are always paired

26.

Two common insulators mentioned in the material are:

a)

Rubber and glass

b)

Copper and aluminum

c)

Iron and steel

d)

Silver and gold

27.

What is the path that electricity follows called?

a)

A circuit

b)

A battery

c)

A magnet

d)

A wire

28.

A complete circuit flows from the power supply through conductors and a load and back to the ________.

a)

power supply

b)

ground

c)

switch

d)

battery

29.

What is the part of the circuit that does work called?

a)

A load

b)

A switch

c)

A wire

d)

A battery

30.

Which of the following is NOT an example of a load?

a)

Power tools

b)

Lights

c)

Electrical equipment

d)

Wire

31.

Match the following forces and units of measurement with their correct symbols or terms:

a)

V

1.

amps

b)

Ω

2.

V

c)

amps

3.

Opposition to current

d)

Law relating voltage, current, and resistance

4.

Ω

e)

W

5.

Law relating voltage, current, and resistance

32.

What is the unit of measurement for electric current?

a)

Amperes (amps)

b)

Volts

c)

Ohms

d)

Watts

33.

What is the unit of measurement for electrical potential difference?

a)

Voltage (V)

b)

Ampere (A)

c)

Ohm (Ω)

d)

Watt (W)

34.

Electric current is measured in which unit?

a)

Volts

b)

Ohms

c)

Amperes (amps)

d)

Watts

35.

One ampere is approximately how many electrons passing through a given point on a conductor per second?

a)

6,240,000,000,000,000,000,000

b)

1,000,000

c)

100,000,000

d)

1,000,000,000,000

36.

High amperage can be transmitted at low voltage, making amps the ________ component of electricity.

a)

dangerous

b)

safest

c)

weakest

d)

smallest

37.

A shock of 0.1–0.2 amps can be fatal.

a)

True

b)

False

38.

What is voltage?

a)

The flow of current in a circuit

b)

The resistance in a wire

c)

The potential energy between two points along an electrical conductor

d)

The power consumed by a device

39.

Voltage is measured in _______.

a)

volts

b)

watts

c)

ohms

d)

amperes

40.

Which of the following are common residential voltages?

a)

12 volts and 24 volts

b)

120 volts and 240 volts AC

c)

60 volts and 90 volts

d)

220 volts and 440 volts

41.

Cars, trucks, and boats usually use (a)   DC systems.

Choose from the below words

24-volt

120-volt

12-volt

240-volt

42.

What is resistance?

a)

Resistance is the restriction to flow.

b)

Resistance is the increase in temperature.

c)

Resistance is the flow of current.

d)

Resistance is the supply of voltage.

43.

Resistance is measured in which unit?

a)

Volts

b)

Amperes

c)

Ohms (Ω)

d)

Watts

44.

According to Ohm’s law, what is the formula that defines the relationship between voltage, current, and resistance?

a)

voltage (V) = current (I) × resistance (R) (V = I × R)

b)

voltage (V) = resistance (R) ÷ current (I) (V = R ÷ I)

c)

voltage (V) = current (I) + resistance (R) (V = I + R)

d)

voltage (V) = resistance (R) - current (I) (V = R - I)

45.

What is the standard unit of electric power?

a)

Watt

b)

Volt

c)

Ampere

d)

Ohm

46.

Fill in the blank: The rate at which work is done is called _______.

a)

power

b)

energy

c)

force

d)

velocity

47.

Fill in the blank: The formula for electric power in terms of voltage and current is _______.

a)

power = voltage × current (P = V × I)

b)

power = voltage + current (P = V + I)

c)

power = voltage ÷ current (P = V ÷ I)

d)

power = current - voltage (P = I - V)

48.

Components can operate at different voltages and still have equal wattage.

a)

True

b)

False

49.

Fill in the blank: watts = _______ × amps.

a)

volts

b)

ohms

c)

watts

d)

joules

50.

Electrical loads convert the power of moving electrons into _________.

a)

Light

b)

Magnetism

c)

Sound

d)

Gravity

51.

Which of the following is NOT a form that electrical loads convert the power of moving electrons into?

a)

Light

b)

Heat

c)

Sound

d)

Water

52.

Electrical loads convert the power of moving electrons into mechanical motion.

a)

True

b)

False

53.

Electrical loads convert the power of moving electrons into which one of the following forms of energy?

a)

Light energy

b)

Nuclear energy

c)

Chemical energy

d)

Solar energy

54.

Which of the following is a common type of lighting?

a)

Incandescent

b)

Solar

c)

Neon

d)

Plasma

55.

Which of the following is a common type of lighting?

a)

Halogen

b)

Neon

c)

Plasma

d)

Xenon

56.

Which of the following is a common type of lighting?

a)

Fluorescent

b)

Neon

c)

Plasma

d)

Xenon

57.

What does LED stand for in lighting?

a)

Light-emitting diode

b)

Light energy device

c)

Low energy diode

d)

Light-emitting display

58.

Fill in the blank: Incandescent lighting uses a ________ resistor coil supported in a vacuum tube.

a)

tungsten

b)

copper

c)

aluminum

d)

iron

59.

What happens to the tungsten in incandescent lighting?

a)

It remains cool

b)

It gets white-hot and emits a great deal of visible light

c)

It melts

d)

It emits no light

60.

Fill in the blank: The most common lighting for DC applications on agricultural vehicles is ________ lighting.

a)

incandescent

b)

fluorescent

c)

halogen

d)

LED

61.

A halogen lightbulb uses a ______ filament encased in a small bulb.

a)

tungsten

b)

copper

c)

aluminum

d)

iron

62.

Which type of gas does a halogen lightbulb contain?

a)

Noble gas

b)

Halogen gas

c)

Oxygen

d)

Nitrogen

63.

Halogen lightbulbs can withstand higher temperatures to produce more light.

a)

True

b)

False

64.

The quartz bulb in a halogen lightbulb is extremely ______.

a)

hot

b)

fragile

c)

cold

d)

opaque

65.

The gas in a halogen lightbulb is under higher pressure than in an incandescent bulb.

a)

True

b)

False

66.

What does the gas in a halogen lightbulb do with the tungsten vapor?

a)

Absorbs it

b)

Combines and redeposits it on the filament

c)

Releases it into the air

d)

Changes its color

67.

The 'recycling' process in a halogen lightbulb enables it to last how much longer?

a)

1 to 2 times longer

b)

2 to 3 times longer

c)

4 to 5 times longer

d)

The same as a regular bulb

68.

How do fluorescent bulbs function?

a)

By heating tungsten filaments

b)

By ionizing mercury vapor in a glass tube

c)

By burning natural gas

d)

By using LED technology

69.

What type of particles does the ionized gas in a fluorescent bulb emit?

a)

Infrared

b)

Ultraviolet (UV)

c)

X-rays

d)

Gamma rays

70.

Fill in the blank: The UV light in a fluorescent bulb causes a ______ coating on the inside of the tube to glow, releasing standard visible light.

a)

phosphor

b)

silicon

c)

tungsten

d)

mercury

71.

Fluorescent bulbs contain a small amount of mercury, which requires responsible disposal of used bulbs.

a)

True

b)

False

72.

What should you do to properly dispose of used fluorescent bulbs?

a)

Contact your waste management service to find a location that accepts fluorescent bulbs.

b)

Throw them in your regular household trash.

c)

Break them and flush the pieces down the toilet.

d)

Burn them in your backyard.

73.

What are light-emitting diode (LED) lamps composed of?

a)

Single or multiple light-emitting diodes

b)

Incandescent filaments

c)

Gas tubes

d)

Mercury vapor

74.

LED lamps last ______ times longer than incandescent bulbs.

a)

six

b)

two

c)

ten

d)

four

75.

Which of the following is NOT a feature of LED lamps?

a)

Use a filament

b)

Consume less power

c)

Last six times longer than incandescent bulbs

d)

Available in a variety of styles

76.

LED lamps consume less power than incandescent bulbs.

a)

True

b)

False

77.

LED lamps are available in a variety of ______.

a)

styles

b)

voltages

c)

colors

d)

brands

78.

Electric heaters may be used for warming _________.

a)

Products

b)

Metals

c)

Liquids

d)

Gases

79.

Electric heaters may be used for warming _________.

a)

Poultry

b)

Books

c)

Metals

d)

Plastic

80.

Electric heaters may be used for warming _________.

a)

Livestock

b)

Books

c)

Plastic toys

d)

Stones

81.

Electric heaters may be used for warming _________.

a)

People

b)

Plastic

c)

Paper

d)

Metal

82.

Electric heaters may be used for warming _________.

a)

Plants

b)

Ice cream

c)

Refrigerators

d)

Swimming pools

83.

A heat element (coil of wires) is heated by creating ______ in an electrical circuit.

a)

resistance

b)

current

c)

capacitance

d)

inductance

84.

Which type of heat is less efficient?

a)

Electrical heat

b)

Gas heat

85.

Electrical heat is commonly used for heating large spaces.

a)

True

b)

False

86.

Name two common agricultural uses for coils of wires as heat elements.

a)

Water heaters and heat lamps

b)

Fencing and crop marking

c)

Seed sorting and grain polishing

d)

Pest control and soil testing

87.

What do electric motors convert?

a)

Mechanical energy to electric motion

b)

Electric energy to mechanical motion

c)

Solar energy to heat

d)

Chemical energy to light

88.

Electric motors may be small enough to drive the hard drive of a computer or large enough to _________

a)

exert tremendous force

b)

fit in your pocket

c)

power a flashlight

d)

be used as a paperweight

89.

In agricultural applications, electric motors are usually seen with a power rating between _________.

a)

1 hp–5 hp

b)

10 hp–20 hp

c)

20 hp–50 hp

d)

50 hp–100 hp

90.

True or False: Electric motors are the same as engines.

a)

True

b)

False

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