1. COMPUTER PRESENTATIONS FOR KS3 SCIENCE - PHYSICS
©2003, STEVE PARKER
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2. KS3 SCIENCE - PHYSICS Energy Transfer1
KS3 SCIENCE
- PHYSICS
Energy
Transfer

3. Energy can never be created or destroyed - it is only ever 3
ENERGY TRANSFERS
Energy can never be created
or destroyed - it is only ever
converted to a different form

4. Devices and machines convert energy from one form to another4
ENERGY TRANSFERS
Devices and machines convert
energy from one form to another
DEVICE
ENERGY
INPUT
USEFUL
ENERGY
OUTPUT

5. Devices and machines convert energy from one form to another5
ENERGY TRANSFERS
Devices and machines convert
energy from one form to another
However, they usually “lose” some
DEVICE
ENERGY
INPUT
USEFUL
ENERGY
OUTPUT
Wasted energy -
e.g. heat, sound

6. kinetic and light energy6
ENERGY TRANSFERS
E.g. fireworks convert
chemical energy into
kinetic and light energy
DEVICE
ENERGY
INPUT
USEFUL
ENERGY
OUTPUT
Wasted energy -
e.g. heat, sound

7. While domestic lamps are used to convert electrical 7
ENERGY TRANSFERS
While domestic lamps are
used to convert electrical
energy into light energy
DEVICE
ENERGY
INPUT
USEFUL
ENERGY
OUTPUT
Wasted energy -
e.g. heat, sound

8. This device is quite efficient This device is very inefficient
If a device transfers most of the energy input usefully then we say that it is ‘efficient’
This device is quite efficient
This device is very inefficient