Ch.5.2

Question 1

Energy can be _________________ from one ______________ into _________________. This is called _________________ _________________.

Answer 1

converted, form, another

energy conversion

Question 2

Examples of energy conversion:
-electric toaster:
_________________ energy -> ________________ energy
-candle:
_________________ energy -> _________________ energy+ _________________ energy when it burns
-photosynthesis (plant):
_________________ energy (from the __________) -> _________________ energy stored in them

Answer 2

Electrical, thermal
Chemical, light, thermal
Light, Sun, chemical

Question 3

Energy conversions that take place in the generation of _________________:
_________________ energy|stored in _________________
V _________________
_________________ energy|of the _________________
V _________________ _________________
_________________ energy|of the _________________
V _________________
_________________ energy|generated by the _________________
V _________________ _________________
_________________ energy + _________________ energy

Answer 3

Electricity
Chemical, fuel
Boiler
Kinetic, steam
Steam engine
Kinetic, wheel
Generator
Electrical, generator
Light bulb
Thermal, light

Question 4

Energy can be _____________________ from one form into another.

Answer 4

Converted

Question 5

Energy can be _____________________ from one form into another but cannot be _____________________ or _____________________. This is the _____________________ __________ _____________________ _________ _____________________.

Answer 5

Converted, created, destroyed, law of conservation of energy

Question 6

Example of law of conservation in energy: the motion of a ball when it falls and then bounces from the ground

1. When a ball falls to the ground, _____________________ energy-> _____________________energy
2. When the ball reaches the ground, _____________________ energy-> _____________________ energy+ _____________________
   - thus, the ball has _____________________ energy after the bounce
   - it __________________ return to the _______________ ________________ at which it is released
3. When the ball bounces up, _____________________ energy-> _____________________ energy

Answer 6

Potential, kinetic
Kinetic, sound, friction
Less, cannot, same height
kinetic, potential

Question 7

A _____________________ diagram is also known as a _________________ _________________ ____________________. In this type of diagram, the _____________________ of the arrows are _____________________ to the amount of energy they represent.
We should _____________________ how many joules does a _____________________ _____________________ in the graph _____________________.
The sum of widths of the two (or more) _____________________ _____________________ _____________________ is equal to the ______________ of the _____________________ _____________________.

Answer 7

Sankey, energy transfer diagram, width, proportional
State, small square, represents
Energy output arrows, width, energy input

Question 8

Energy converters are _____________________________________________________________________________________________________________________________________________________________________________________.
Examples: _____________________ _______________, __________________

Answer 8

devices or appliances that convert energy from one form to another form of useful energy
electric fan, lamp

Question 9

The efficiency of an energy converter is a measure of _______________________________________________________________________________________________________________.

Answer 9

how much energy input is converted into useful energy output

Question 10

The formula for the efficiency of an energy converter is:
______________________________________________
————————————————————- X 100%
______________________________________________

Answer 10

Useful energy output
—————————— X 100%
total energy input