Download Energy transfers Fact sheet

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Year 7 Physics: Energy
Energy Transfers Fact Sheet
This sheet contains all the facts you need to learn as part of this topic. You will be
asked to learn them for homework and tested on them in your lessons.
Homework 1: Learn facts 1-10 Due: ……………………………
Homework 2: Learn facts 11-20 Due: ……………………………
Fact
Question
1
What is meant by the term energy?
2
What is energy measured in?
3
What is an energy transfer?
4
5
6
7
8
9
10
11
12
Which store is filled when the object
moves?
Which store is filled when an object
is warmed up?
Which store is filled when an object
is lifted?
Which store is filled when an object
is stretched or compressed?
What type of store is found in fuel,
batteries and food?
What type of transfer happens when
an object moves due to a force
being applied e.g. pull?
What type of transfer happens when
a current flows through a circuit?
What type of transfer happens when
energy is transferred from a hotter
to a colder object?
What type of transfer happens when
energy is transferred by light?
Answer
Energy is the ability to do ‘work’
(energy makes things happen e.g.
movement).
Joules (J)
When energy is moved from one
energy store to another energy store.
Kinetic energy store.
Thermal energy store.
Gravitational potential energy store.
Elastic potential energy store.
Chemical energy store.
Energy is being transferred
mechanically.
Energy is being transferred electrically.
Energy is being transferred by heating.
Energy is being transferred by
radiation.
Learnt?
13
How is work done calculated?
14
What is meant by the conservation
of energy?
15
What does dissipate mean?
16
What is efficiency?
17
How is efficiency calculated?
18
What is power?
19
What is the unit for power?
20
How is power calculated?
Work = Force x distance.
The total amount of energy before and
after a transfer has taken place is the
same – energy is not lost or gained.
That energy spreads out and is no
longer useful.
A measure of how much useful energy
is transferred.
Efficiency = useful output energy
transfer ÷ total input energy transfer.
How quickly energy is transferred by a
device.
Watts (one Watt is the same as one
joule per second)
P=E ÷ t or P = W ÷ t.
Quick check – can you interpret this Sankey diagram?
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What is the input energy?
What is the useful output energy?
Which is the wasted energy?
How efficient is this device?