Physics

Front 1

Kinetic energy

Back 1

1/2 x m x v x v

Front 2

Spring constant

Back 2

Force | extension

Front 3

Extension

Back 3

Stretched - unstreached

Front 4

Elastic potential

Back 4

0.5 x k x e x e

Front 5

Gravitational energy

Back 5

Ep = m x g x h

Front 6

Specific heat capacity

Back 6

AE = m x c x AO

Front 7

Work done is affected by

Back 7

Size of force and distance travelled

Front 8

Work done

Back 8

Force x Distance

Front 9

Power

Back 9

Work done | time taken

Front 10

Conservation of energy

Back 10

Total amount of energy present stays the same as the amount before and after any changes

Front 11

Energy transfers

Back 11

Energy can be transferred, stored and dissipated

Front 12

How to reduce unwanted energy transfers

Back 12

Lubrication, tightening loose parts and thermal insulation

Front 13

Efficiency

Back 13

How good something is at transferring one energy into another useful form

Front 14

Electrical appliances

Back 14

Transfer electrical energy into another form eg, fan

Front 15

Efficiency equation

Back 15

Useful output energy transfer / total input energy transfer

Front 16

Percentage efficiency

Back 16

Efficiency X 100

Front 17

Renewable energy

Back 17

Wind

Water

Biofuel

Geothermal

Solar

Front 18

Non renewable energy

Back 18

Wood

Co

Oil

Nuclear

Natural gas

Front 19

3 main uses of energy

Back 19

Transport

Electricity generation

Heating

Front 20

Electrical charge and current

Back 20

Charge = current (a) X time (s)

Front 21

Electrical current is the rate of flow of charge

Back 21

Current = charge / time

Front 22

Electrical circuit

Back 22

If you break the circuit any where everything will stop

Front 23

Resistors

Back 23

Specially designed to provide resistance can speed up of low or slow down if high the current flow

Front 24

Resistance

Back 24

Voltage / current

Measures in ohms

Front 25

Ohms law

Back 25

The current through a metallic conductor is directly proportional to the potential difference across its ends where the temperature and other conditions are constant

( current and voltage are directly proportional )

Front 26

Metallic conductors (ohms law)

Back 26

Directly proportional

Straight line

Front 27

Filament lamp

Back 27

Not directly proportional

S shape through graph

As filament heats the resistance increases

Front 28

Diode

Back 28

Allows electrical current to pass in one direction. Whilst being blocked from travelling the other way ( anode-cathode)

——/ - that shape through graph

Front 29

Thermistors

Back 29

A resistor that responds to changes in temp

Hotter more current flows

Electrons break from bond and become free to take part in conduction

Eg. Temp rises

Resistance goes down

Total resistance goes down

Greater current flow

Lamp gets brighter

Front 30

LDR

Back 30

Resistor that responds to light intensity

Light intensity increases and more free electrons are created, resistance increases

Eg. Light increases

LDR resistance goes down

Total resistance drops

Greater current flow

Louder bizz

Front 31

Finding resistance of a number of resistors in a series

Back 31

Add the resistances off resistors together

Front 32

Parallel circuits

Back 32

Circuits which have junctions whet the electrical pathway divides/branches

Front 33

Total current

Back 33

I total = I1 +I2 +I3

Front 34

Voltage in a parallel circuit

Back 34

Voltage is the same everywhere

Front 35

Total resistance in a parallel circuit

Back 35

R total = V/I