4974441
Description
Mind Map by Connie Theobald, updated more than 1 year ago
|
Created by Connie Theobald
over 10 years ago
|
|
P1.2- Using energy
- Forms of energy
- Energy exists in different forms such as:
- Light: sunlight
- Sound: Guitars
- Kinetic: energy in moving objects.
- Nuclear
- Electrical: lightning
- Gravitational potential:
skydivers
- Elastic potential: catapult
- Chemical:
organic foods
- Light: sunlight
- Energy can be
transferred from
one form to
another.
- Any object abouve
ground has gravitational
potential energy
- A falling object transfers
gravitational potential
energy to kinetic energy
- Energy exists in different forms such as:
- Conservation of energy
- Energy cannot be created or destroyed. It is only possible to transfer it from one
form to another, or from one place to another. This means that the total amount of
energy is always the same. This is called the conservation of energy and it applies
to all energy transfers.
- In a solar cell, light energy is transferred
to electrical energy.
- Stretching an elastic band transfers chemical energy to
elastic potential energy.
- When an object falls,
gravitational potential
energy is transferred to
kinetic energy.
- Energy cannot be created or destroyed. It is only possible to transfer it from one
form to another, or from one place to another. This means that the total amount of
energy is always the same. This is called the conservation of energy and it applies
to all energy transfers.
- Energy and efficiency
- Energy is measured in joules (j).
- input energy = useful energy + energy wasted
- Efficiency of an appliance= (useful energy transferred
by the appliance/total energy supplied to the
appliance)*100
- No machine can be 100% efficient
- Measures to make machine more efficient include reducing:
friction, air resistance, electrical resistance, noise due to
vibractions
- Efficiency is a ratio. This means that it has no unit.
- Energy transfer through an appliance
can be representedd with a Sankey
diagram.
- Energy is measured in joules (j).
- Useful energy
- Useful energy is energy in the place
we want it and the form we need it.
- Wasted energy is energy
that is not useful energy.
- Useful energy and wasted energy
both end up being transferred to
the surroundings, which become
warmer.
- As energy spreads out, it gets more and more
difficult to use for further energy transfers.
- Useful energy is energy in the place
we want it and the form we need it.
Media attachments
Want to create your own Mind Maps for free with GoConqr? Learn more.