AQA P1a Energy

P1A section three

HideShow resource information
Preview of AQA P1a Energy

First 58 words of the document:

Types of energy
Type of energy Description
Magnetic Energy in magnets and
Kinetic The energy in moving
objects. Also called
movement energy.
A bullet cutting a playing
Heat Also called thermal energy
Burning match
Light Also called radiant energy

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Gravitational Stored energy in raised
potential objects
Sky divers
Chemical Stored energy in fuel, foods
and batteries
Organic food
Sound Energy released by vibrating
Electrical Energy in moving or static
electric charges
Elastic potential Stored energy in stretched
or squashed objects
Catapult…read more

Page 3

Preview of page 3

Here's a taster:

Nuclear Stored in the nuclei of
Nuclear fuel assembly
Energy transfer
Different types of energy can be transferred from one type to another. Energy transfer
diagrams show each type of energy, whether it is stored or not, and the processes taking
place as it is transferred. Sankey diagrams also show the relative amounts of each type
of energy.
Energy transfer diagrams
This energy transfer diagram shows the useful energy transfer in a car engine.…read more

Page 4

Preview of page 4

Here's a taster:

Process of using electrical energy
Notice that these energy transfer diagrams only show the useful energy transfers.
However, car engines are also noisy and hot, and electric lamps also give out heat
Sankey diagrams
Sankey diagrams summarise all the energy transfers taking place in a process. The thicker
the line or arrow, the greater the amount of energy involved. The Sankey diagram for an
electric lamp below shows that most of the electrical energy is transferred as heat rather
than light.…read more

Page 5

Preview of page 5

Here's a taster:

Wasted' energy
Energy cannot be created or destroyed. It can only be transferred from one form to
another or moved. Energy that is 'wasted', like the heat energy from an electric lamp,
does not disappear. Instead, it is transferred into the surroundings and spreads out so
much that it becomes very difficult to do anything useful with it.
Electric lamps
Ordinary electric lamps contain a thin metal filament that glows when electricity passes
through it.…read more

Page 6

Preview of page 6

Here's a taster:

From the diagram, you can see that much less electrical energy is transferred, or
'wasted', as heat energy.
Calculating efficiency
The efficiency of a device such as a lamp can be calculated using this equation:
efficiency = ( useful energy transferred ÷ energy supplied ) × 100
The efficiency of the filament lamp is (10 ÷ 100) × 100 = 10%.
This means that 10% of the electrical energy supplied is transferred as light energy (90%
is transferred as heat energy).…read more


No comments have yet been made

Similar Physics resources:

See all Physics resources »See all resources »