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Sci 9 Unit D 3.0 Energy Power Efficiency

Total questions: 91

Worksheet time: 1hrs 23mins

Name
Class
Date
1.

What energy transformations take place when a battery-operated speaker is being used?

a)

electrical --> chemical -->light

b)

sound --> chemical --> mechanical

c)

chemical --> electrical --> sound

d)

light --> electrical --> thermal

2.

People get energy from the food that they eat and transform that energy as they move.

Which energy transformations occur as a person rapidly rubs the palms of their hands together?

a)

kinetic to thermal to electrical

b)

chemical to kinetic to thermal

c)

mechanical to chemical to sound

d)

chemical to sound to electrical

3.

Which of the following devices primarily transforms electrical energy into mechanical energy?

a)

b)

c)

d)

4.

The diagram shows a complete circuit with a battery and a buzzer that is making noise. The main energy transformations in this circuit are:

a)

chemical to electrical to sound.

b)

electrical to thermal to light.

c)

sound to electrical to chemical.

d)

mechanical to electrical to sound.

5.

Which of the following shows the correct order of the energy transformations that occur during photosynthesis in plants?

a)

chemical to thermal

b)

light to chemical

c)

thermal to light

d)

chemical to electrical

6.

what type of energy is stored in a battery? (a)  

Choose from the below words
electrical
chemical
thermal
mechanical
7.

A car battery's energy transformation is...

a)

sound to kinetic

b)

light to heat

c)

mechanical to electrical

d)

chemical to electrical

8.
Energy transformations occur when...
a)
energy is created through conduction
b)
energy changes from one form to another
c)
two forces slide together that are touching
d)
a chemical reaction takes place
9.

When the roller coaster cart is moving from position W to position X, the energy transformation is

a)

electrical to kinetic

b)

gravitational to electrical

c)

gravitational to kinetic

d)

chemical to electrical

10.

"Energy can be transformed from one form into another or transformed from one region or another, but energy cannot be created or destroyed."

Which law is this?

a)

Law of Conservation of Mass

b)

Newton's Second Law

c)

Law of Conservation of Energy

d)

Kepler's Third Law

11.
Which of the following converts chemical energy to thermal energy?
a)
Battery
b)
Person riding a bike
c)
Automobile
d)
Camp Fire
12.

The energy transformation that takes place when this battery-operated flashlight is turned on:

a)

Chemical --> electrical --> light

b)

Chemical --> light --> electrical

c)

Electrical --> thermal --> light

d)

Electrical --> light --> electrical

13.

In energy transformations, "wasted energy" usually takes what form?

a)

thermal

b)

chemical

c)

light

d)

sound

14.

The rate at which a device converts energy is known as

a)

Transformation

b)

Power

c)

Energy

d)

Resistance

15.

Energy is measured in

a)

Joules

b)

Watts

c)

Percent

d)

Ohms

16.

The unit for energy and work is ...

a)

Amperes

b)

Watts

c)

Newtons

d)

Joules

17.

What is the unit for power?

a)

Watt

b)

Joule

c)

Meters

d)

Newtons

18.

The power formula is

a)

Power = Current - Voltage

b)

Power = Current + Voltage

c)

Power = Current x Voltage

d)

Power = Current x Resistance

19.

The current in an appliance is 3 A and the voltage from the wall outlet is 120 V.

How much power is being supplied to the appliance?

a)

10000 W

b)

220 W

c)

420 W

d)

360 W

20.

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
21.

What is the efficiency of the machine if the energy input is 263 J and the useful energy output is 142 J? 

a)

6.26%

b)

54%

c)

100%

d)

260%

22.

Lucas has been challenged to increase the efficiency of a device he is redesigning. His goal is 90% efficiency. The energy input of the device is fixed at 10 joules, so Lucas is trying to improve energy output.

How many joules of useful energy output should Lucas aim for to attain his goal of 90% efficiency?

a)
9 Joules
b)
900 Joules
c)
0.9 Joules
d)
25 
23.

A bird used 8 watts of power and flew for 5 seconds.  How much energy did the bird use?

a)

40 watts

b)

40 joules

c)

1.6 watts

d)

1.6 joules

24.

How much energy is used by a 500 watt microwave oven for 5 minutes?

a)

150,000 J

b)

2500 J

25.

How much energy is used by a 60 watt light bulb for 125 seconds?

a)

2.1 J

b)

7 500 J

26.

How much energy is used in 30 seconds by a 1000-watt microwave oven?

a)

30,000 Watts 

b)

33.3 Joules

c)

30,000 Joules

27.

The type of light bulb in the picture is...

a)

incandescent

b)

halogen

c)

LED

d)

fluorescent

28.

The type of light bulb banned in Canada due to low efficiency is ...

a)

incandescent

b)

halogen

c)

LED

d)

fluorescent

29.

The type of light bulb that is most efficient is ...

a)

halogen

b)

LED

c)

fluorescent

30.

What is the part of a simple motor that acts as a swtich to reverse the direction of current through the wire coil every half-turn?

a)

The armature

b)

The brushes

c)

The commutator

d)

The slip rings

31.

What does the commutator do in an electric motor?

a)

stops the flow of electricity

b)

absorbs the current

c)

reverses the flow of current in the armature

d)

produces a magnetic field

32.

A device which converts mechanical energy to electrical energy is called a...

a)

motor

b)

generator

c)

hair dryer

d)

blender

33.

Which part of an motor acts as a current switching device?

a)

armature

b)

rotor

c)

commutator

d)

brushes

34.

This is a device that converts electrical energy into mechanical energy...

a)

motor

b)

circuit

c)

generator

d)

electromagnet

35.

What part of the motor spins?

a)

Armature

b)

Commutator

c)

Brush

d)

Permanent Magnet

36.

Permanent magnets, commutator, brushes, and armature are all part of...

a)

a motor

b)

a generator

c)

an electromagnet

d)

a transistor

37.

An electromagnet can be turned on and off.

a)

True

b)

False

38.

Increasing the number of coils of wire in the armature will cause the motor to spin faster.

a)

True

b)

False

39.

The part of the electric motor that transfers the current into the commutator is....

a)

terminal

b)

permanent magnet

c)

armature

d)

brush

40.

The picture is showing ...

a)

a motor

b)

a generator

c)

an electromagnet

d)

a transformer

41.

This picture is showing ...

a)

an electromagnet

b)

a motor

c)

a generator

d)

a transformer

42.

The picture is showing a simple...

a)

motor

b)

generator

c)

electromagnet

d)

commutator

43.

Current can be generated by ...

a)

moving an iron rod through a coil of wire

b)

moving a magnet through a coil of wire

c)

moving a battery through a magnetic field

d)

moving a commutator through a coil of wire

44.

A motor and a generator both have permanent magnets and a coil of wire.

a)

true

b)

false

45.

In a ceiling fan, which part of the motor are the blades attached to?

a)

Armature

b)

Commutator

c)

Brush

d)

Permanent Magnet

46.

A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of useful thermal energy. How efficient is the kettle?

a)

100%

b)

7%

c)

93%

d)

95%

47.

A washing machine uses 250J of electrical energy to produce 124J of useful output energy. How efficient is the washing machine?

(a)   %

Answer in nearest tenth.

48.

Energy cannot be created or destroyed, only transformed.

a)

True

b)

False

49.

Heat energy is also called ______ energy.

a)

chemical

b)

electrical

c)

mechanical

d)

thermal

50.
In energy transformations, "wasted energy" usually takes what form?
a)
heat
b)
chemical energy
c)
light
d)
sound waves
51.
What kind of energy is represented in the picture?
a)
Thermal
b)
Chemical
c)
Sound
d)
Nuclear
52.

If this device is a light bulb, how much energy is wasted?

a)

10 J

b)

100 J

c)

90 J

d)

190 J

53.

If this device is a light bulb, what is the efficiency?

a)

10 %

b)

90 %

c)

100 %

54.

Identify the energy transformation.

a)

electrical to chemical to light

b)

electrical to thermal to light

c)

chemical to electrical to light

d)

light to electrical to chemical

55.

A kettle uses 1400J of electrical energy to produce 8J of sound energy and 1392J of thermal energy. How efficient is the kettle?

(a)   %

Answer in the nearest tenth.

56.

A blender uses 1000 J of energy to spin it's blades and make smoothies. What is the input energy?

a)

Electrical

b)

Sound

c)

Heat

d)

Mechanical

57.

An oven uses electrical energy to produce heat, light, and sound.

If the oven produces 400 J of heat, 75 J of light, and 50 J of sound, how much input electrical energy did it have?

a)

400 J

b)

500 J

c)

525 J

d)

375 J

58.

A TV uses 200 J of electricity and transforms it into 125 J of sound and light and also 75 J of wasted heat. How efficient is it?

(a)   %

Answer in the nearest tenth.

59.

Select the output energy types

a)

electrical

b)

light

c)

sound

d)

thermal

e)

kinetic

60.
If the hair dryer and the vacuum cleaner are both on, what is the power used?
a)
2600 watts
b)
400 watts
c)
2200 watts
d)
1100 watts
61.

If a 13w bulb is left on for 30 minutes, how much energy is used?

a)

390 J

b)

1800 J

c)

23,400 J

d)

1,404,000 J

62.

A Keurig coffee machine draws 5 A. The voltage of the outlet is 120 V. How much power is required?

a)

600 w

b)

300 w

c)

24 w

d)

5 w

63.

What is the output energy produced by moving a permanent magnet through a coil of copper wire?

a)

thermal

b)

electrical

c)

sound

d)

mechanical

64.

What is the input energy for a generator?

a)

Thermal

b)

Mechanical

c)

Electrical

d)

Potential

65.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
66.

In order for an electromagnet to be formed, an ​ (a)   current must pass through a coil of ​ (b)   wrapped around an ​ (c)   core.​ ​

Choose from the below words
electric
wire
iron
67.
Which of these pairs of devices operate in reverse of each other?
a)
generator and motor
b)
generator and electromagnet
c)
motor and electromagnet
d)
electromagnet and resistor
68.

Which of the following represents how generators convert energy?

a)

chemical energy -----------> solar energy

b)

mechanical energy ------------> chemical energy

c)

mechanical energy -----------> electrical energy

d)

electrical energy ------------> mechanical energy

69.

Which of the following are true for motors? Select all that apply.

a)

Motors transform electrical energy into mechanical energy.

b)

Motors contain an electromagnet that spins between a permanent magnet.

c)

Motors transform chemical energy into electrical energy.

d)

A motor spins due to the attraction and repulsion of magnets.

70.

A spinning turbine moves magnets which generates an electric current is the description of

a)

an electromagnet

b)

a permanent magnet

c)

a motor

d)

a generator

71.

Which of the following best describes a simple electric motor?

a)

It converts electric energy into chemical energy and wasted heat.

b)

It converts mechanical energy into electric energy and wasted heat.

c)

It converts electric energy into mechanical energy and wasted heat.

d)

It converts mechanical energy into chemical energy and wasted heat.

72.

Which part of the motor is the commutator?

a)

A

b)

B

c)

C

d)

D

73.

5600J of electrical energy is transformed into 4000J mechanical energy + 600J sound energy + 1000J thermal energy

What is the efficiency of the blender?

a)

17%

b)

71 %

c)

82 %

d)

100 %

74.

Which part of the motor is a brush?

a)

A

b)

B

c)

C

d)

D

75.

Which part of the motor is an armature?

a)

A

b)

B

c)

C

d)

D

76.

Which part of the motor is a permanent magnet?

a)

A

b)

B

c)

C

d)

D

77.

Which part of the motor spins?

a)

A

b)

B

c)

C

d)

D

78.

Which part of the motor acts as a switch?

a)

A

b)

B

c)

C

d)

D

79.

Which part of the motor acts as an electromagnet?

a)

A

b)

B

c)

C

d)

D

80.

Identify the energy transfer

a)

chemical to kinetic

b)

solar to electrical

c)

thermal to light

d)

electrical to light

81.

Which bulb is most efficient ?

a)

Bulb A

(20 ÷ 100) x 100 = 20% light

b)

Bulb B

(5 ÷ 50) x 100 = 10% light

82.

A hairdryer uses 300J of energy to produce 60J of sound energy and 240J of thermal energy. Calculate it's efficiency.

a)

80%

b)

90%

c)

20%

d)

100%

83.

How much energy is wasted as sound?

a)

350J

b)

450J

c)

250J

d)

550J

84.

How much energy is wasted as thermal energy

a)

24

b)

16

c)

14

d)

12

85.

How can you find out the power of an appliance?

a)

see how hot it gets when switched on

b)

see what voltage it needs

c)

look for the efficiency label

d)

look for the power rating on the label

86.

This car needs 8600J of energy to power it. If 5000J is changed into useful energy, how much energy is wasted?

a)

13600J

b)

3600J

c)

5000J

d)

8600J

87.

What is the energy efficiency of the drill?

Responses

a)

90%.

b)

20%.

c)

100%.

d)

70%

88.

What is the input energy?

a)

light

b)

heat

c)

electrical

89.

The energy diagram shown would best match which device?

a)

toaster

b)

LED bulb

c)

car engine

d)

kettle

90.

A subwoofer with a resistance of 3Ω needs a household voltage of 110 V to push a current of 5.25 A through its coil. What is the power used by the subwoofer?

(a)   W

Answer in nearest tenth.

91.

An electric bulb is connected to a 220V generator. The current is 0.58 A and the resistance of the bulb is 245Ω. What is the power of the bulb?

(a)   W

Answer in nearest tenth.

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