Quiz about P303 - Efficiency

Question 1

The Law of Conservation of Energy states:

Accepted Answer

Energy cannot be created or destroyed, it can only transformed

Answer

Energy can created or destroyed but not transformed

Answer

Energy can't be created, destroyed or transformed

Answer

Energy cannot be created or destroyed.

Question 2

What kind of energy does an object possess when it's resting on top of the hill?

Accepted Answer

Potential Energy

Answer

Chemical Energy

Answer

Kinetic Energy

Answer

All of the above

Question 3

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

Accepted Answer

93%

Answer

100%

Answer

7%

Answer

95%

Question 4

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

Accepted Answer

50%

Answer

5%

Answer

55%

Answer

100%

Question 5

What type of device might this Sankey be about?

Accepted Answer

A very inefficient incandescent light bulb

Answer

A very efficient LED light bulb

Answer

A coal power plant

Answer

A wind turbine

Question 6

No machine in existence has 100% efficiency due to ____________________.

Accepted Answer

friction

Answer

magic

Answer

smoke

Answer

input

Question 7

Total energy = 200J
Useful energy = 20J

Workout the efficiency of this lightbulb.
$$efficiency\ =\ \frac{useful\ enegy}{total\ energy\ in}\ imes100$$

Accepted Answer

10%

Answer

100%

Answer

80%

Answer

40%

Question 8

To save energy, what should you do when you leave a room ?

Accepted Answer

SHUT OFF THE LIGHTS AND TELEVISION

Answer

USE ELECTRICAL ENERGY

Answer

TURN ON THE LIGHTS AND TELEVISION

Answer

HANG YOUR CLOTHES OUTSIDE

Question 9

How can you dry your clothes to save energy?

Accepted Answer

Hang the clothes to dry outside on a line

Answer

Use the dryer machine

Answer

Don't dry your clothes

Answer

Leave the fridge door open

Question 10

To increase the EFFICIENCY of energy use, we could...

Accepted Answer

Turn off lights when not in use

Answer

Keep the car running as you go into the store

Answer

Water the plants in a drought

Question 11

Another way to save energy is to...

Accepted Answer

Conserve it

Answer

Waste it

Answer

Use it

Question 12

What is energy conservation?

Accepted Answer

Reducing energy use

Answer

Adding up all your energy use

Question 13

What is the definition of energy dissipation?

Accepted Answer

The spreading out or scattering of energy

Answer

The total amount of energy that is concentrated

Answer

The total amount of energy that is used efficiently

Answer

The total amount of energy that is created or destroyed

Question 14

What is the definition of the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed; it can only be transferred from one form to another

Answer

The power that makes things happen

Answer

The energy that is not being used efficiently

Answer

The energy that travels in waves

Question 15

What is the definition of energy flow?

Accepted Answer

The transfer of energy from one form to another

Answer

The total amount of energy that is created or destroyed

Answer

The total amount of energy that is used efficiently

Answer

The total amount of energy that is concentrated

Question 16

What is the definition of energy?

Accepted Answer

The power that makes things happen

Answer

The energy that travels in waves

Answer

The force that happens when things rub against each other

Answer

The energy that is not being used efficiently

Question 17

What is the definition of concentrated?

Accepted Answer

Gathered closely together in one place or area

Answer

Not being used efficiently or effectively

Answer

Related to how things move or work

Answer

Related to motion or movement

Question 18

What is the definition of a Sankey diagram?

Accepted Answer

A way of visually representing the energy transfers in a device

Answer

The energy that travels in waves

Answer

The power that makes things happen

Answer

The energy that is not being used efficiently

Question 19

What is the definition of kinetic?

Accepted Answer

Related to motion or movement

Answer

Not being used efficiently or effectively

Answer

Related to how things move or work

Answer

Related to heat or getting hot

Question 20

What is the definition of energy output?

Accepted Answer

The energy that is produced by a device or system

Answer

The total amount of energy that is used efficiently

Answer

The total amount of energy that is created or destroyed

Answer

The total amount of energy that is concentrated

Question 21

What is the definition of mechanically?

Accepted Answer

Related to how things move or work

Answer

Not being used efficiently or effectively

Answer

Related to heat or getting hot

Answer

Related to motion or movement

Question 22

What is the definition of energy efficiency?

Accepted Answer

Using energy in the best possible way to get the most out of it and not waste any

Answer

The power that makes things happen

Answer

The energy that is not being used efficiently

Answer

The energy that travels in waves

Question 23

What is the definition of thermally?

Accepted Answer

Related to heat or getting hot

Answer

Related to motion or movement

Answer

Related to how things move or work

Answer

Not being used efficiently or effectively

Question 24

What is the definition of energy input?

Accepted Answer

The energy that is put into a device or system

Answer

The total amount of energy that is created or destroyed

Answer

The total amount of energy that is used efficiently

Answer

The total amount of energy that is concentrated

Question 25

What is the energy efficiency of a system with an input energy of 500 joules and a useful output energy of 100 joules?

Accepted Answer

20%

Answer

25%

Answer

50%

Answer

100%

Question 26

What is the energy efficiency of a system with an input energy of 200 joules and a useful output energy of 150 joules?

Accepted Answer

75%

Answer

50%

Answer

100%

Answer

25%

Question 27

What does a higher energy efficiency mean?

Accepted Answer

Less energy is wasted

Answer

The system is not converting energy

Answer

The system is not functioning properly

Answer

More energy is wasted

Question 28

What is the energy efficiency of a stereo with an input energy of 20 kJ and a sound output energy of 15000 joules?

Accepted Answer

75%

Answer

25%

Answer

100%

Answer

50%

Question 29

What is the energy efficiency of a lightbulb with an input energy of 10000 joules and a thermal output energy of 8000 joules? There are only two forms of energy produced.

Accepted Answer

20%

Answer

100%

Answer

80%

Answer

25%

Question 30

What is the formula for calculating energy efficiency?

Accepted Answer

Energy Efficiency = (Useful Output Energy / Input Energy) x 100%

Answer

Energy Efficiency = (Input Energy / Useful Output Energy) x 100%

Answer

Energy Efficiency = (Input Energy - Useful Output Energy) x 100%

Answer

Energy Efficiency = (Useful Output Energy x Input Energy) / 100%

Question 31

What is the energy efficiency of a car with an input energy of 1000 joules and a kinetic output energy of 800 joules?

Accepted Answer

80%

Answer

100%

Answer

25%

Answer

50%

Question 32

What is the energy efficiency of a system with an input energy of 100 joules and a wasted output energy of 50 joules?

Accepted Answer

50%

Answer

25%

Answer

200%

Answer

100%

Question 33

What is the energy efficiency of a heater with an input energy of 5000 joules and a thermal output energy of 2000 joules?

Accepted Answer

40%

Answer

100%

Answer

25%

Answer

50%

Question 34

What is the energy efficiency of a modern LED light bulb that consumes 8 watts of electricity and emits 6 watts of visible light?

Accepted Answer

75%

Answer

10%

Answer

100%

Answer

6%

Question 35

What is the useful output energy in the energy efficiency formula?

Accepted Answer

The amount of energy that is converted into the desired work or output

Answer

The total energy input into the system or device

Answer

The amount of energy wasted by the system or device

Answer

The amount of energy produced by the system or device

Question 36

What is the purpose of calculating energy efficiency?

Accepted Answer

To make informed decisions about energy consumption

Answer

To reduce energy efficiency

Answer

To make energy systems more complex

Answer

To increase energy waste

Question 37

What is energy efficiency?

Accepted Answer

A measure of how well a system converts energy into useful work

Answer

The amount of energy wasted by a system

Answer

The amount of energy produced by a system

Answer

The total amount of energy used by a system

Question 38

What is the energy efficiency of a system with an input energy of 50000 joules and a useful output energy of 20000 joules?

Accepted Answer

40%

Answer

100%

Answer

50%

Answer

25%

Question 39

What is the energy efficiency of a traditional incandescent light bulb that consumes 60 watts of electricity and emits 6 watts of visible light?

Accepted Answer

10%

Answer

60%

Answer

100%

Answer

6%

Question 40

What is the energy efficiency of a TV with an input energy of 2000 joules which has 500 J of energy thermally dissipate to the surroundings.

Accepted Answer

75%

Answer

25%

Answer

100%

Answer

50%

P303 - Efficiency

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