8953433
Description
Mind Map by Izzy Pearl (Student-SS), updated more than 1 year ago
|
Created by Izzy Pearl (Student-SS)
over 7 years ago
|
|
Physics Revision 2017
- REFLECTION
- angle of incidence = angle of reflection
- Regular Reflections
- occur at shiny surfaces like mirrors
- When a beam of parallel light rays is incident on a
smooth and plane surface the reflected rays will also
be parallel and it is called the regular reflection
- Regular reflection: Reflection from a polished surface is
called regular reflection. The rays are parallel. Give glaze
to our eyes. Example, plain mirror. Diffused Reflection:
Reflection from a rough surface is called diffuse reflection.
The rays are not parallel. It makes objects visible.
Example, wall.
- occur at shiny surfaces like mirrors
- Diffuse Reflections
- Rough surfaces like paper
- A reflection of light from a surface such that an
incident ray is reflected at many angles rather
than just one, like a regular reflection!
- Rough surfaces like paper
- angle of incidence = angle of reflection
- REFRACTION
- light travels more slowly in
transparent media such as
glass, perspex and water
than it does in air
- because the light slows
down, a ray of light bends
towards the normal when
it passes from air into
glass, perspex or water
- air= fast
- glass= slow
- diamond= very slow
- because the light speeds
up, a ray of light bends
away from the normal
when it passes from glass,
perspex or water into air
- light travels more slowly in
transparent media such as
glass, perspex and water
than it does in air
- ELECTRICITY
- Insulators and conductors
- Many metals, such as copper, iron
and steel, are good electrical
conductors. That is why the parts
of electrical objects that need to
let electricity pass through are
always made of metal.
- Some common insulator materials are
glass, plastic, rubber, and wood.
Insulators are used to protect us from
the dangerous effects of electricity
flowing through conductors.
- a complete circuit of
conductors is needed
for current to flow
- Many metals, such as copper, iron
and steel, are good electrical
conductors. That is why the parts
of electrical objects that need to
let electricity pass through are
always made of metal.
- Circuits
- Electric charge
- can be positive or negative
- measured in coulombs (c)
- not always measured directly
- can be positive or negative
- Electric Current
- the flow of charge
- larger current means more charge per second moving through the circuit
- flows from positive to negative
- has the same value at all points in a series circuit
- depends on the number and voltage of
cells and the number and resistance of
other components in the circuit
- not "used up"
- measured in 'coloumbs per second' or
amps (A)
- measured using an ammeter in series
- amps= A
- measured using an ammeter in series
- has symbol 'I'
- the flow of charge
- Voltage
- volts push current around an electric circuit
- has symbol 'V'
- measured using a voltmeter
- measured in joules per coulomb or volts (V)
- across a component such as a bulb is the energy
changed from electrical to other forms by each
coulomb of charge passing through the
component
- across a cell or power supply is the
energy given to each coulomb of
charge by the cell or power supply
- volts push current around an electric circuit
- Resistance
- opposes the flow of charge
- has symbol 'R'
- measured in ohms (Ω)
- higher resistance means
lower current if voltage is
kept the same
- ‘short circuit’ is a low
resistance short cut in
a circuit
- depends on material
- opposes the flow of charge
- Electrical Safety
- green and yellow
- Earth wire
- Earth wire
- brown
- live wire
- live wire
- blue
- neutral wire
- neutral wire
- green and yellow
- Insulators and conductors
- Energy resources
- oil
- gas
- coal
- biomass
- food
- wind
- waves
- batteries
- renewable is when something can be used again
- solar energy
- tidal energy
- wind power
- solar energy
- non renewable is when something is used up
- coal
- fossil fuels
- oil
- coal
- The Sun
- (in) directly linked
- solar energy
- wind energy
- hydropower
- wave energy
- fossil fuels
- solar energy
- not linked
- nuclear
- tidal
- moon
- moon
- geothermal
- heat of the earth
- heat of the earth
- nuclear
- (in) directly linked
- electricity is generated by means of a
variety of energy resources
- Although energy is always conserved, it may be dissipated (become less concentrated), reducing its
availability as a resource.
- Principal of Conservation of mass
- The law of conservation of energy states that the
total energy of an isolated system remains
constant—it is said to be conserved over time. Energy
can neither be created nor destroyed; rather, it
transforms from one form to another.
- The law of conservation of energy states that the
total energy of an isolated system remains
constant—it is said to be conserved over time. Energy
can neither be created nor destroyed; rather, it
transforms from one form to another.
- Principal of Conservation of mass
- Greenhouse effect
- We need to move
away from carbon
dioxide producing
forms of energy
resources.
- The greenhouse effect is the process by which radiation
from a planet's atmosphere warms the planet's surface to
a temperature above what it would be without its
atmosphere. If a planet's atmosphere contains radiatively
active gases (i.e., greenhouse gases) the atmosphere will
radiate energy in all directions.
- Greenhouse gases such as water vapour, methane
and carbon dioxide stop heat escaping from the
Earth into space. An increased greenhouse effect
can lead to global warming and climate change.
- We need to move
away from carbon
dioxide producing
forms of energy
resources.
- oil
- Magnetism and Electromagnetism
- North-seeking and South-seeking magnetic poles.
- like poles repel
- unlike poles attract
- like poles repel
- An electric current is surrounded by a magnetic field.
- A current in a coil produces a magnetic field pattern
similar to that of a bar magnet.
- North-seeking and South-seeking magnetic poles.
Media attachments
Want to create your own Mind Maps for free with GoConqr? Learn more.