Electricity

Charge=

current x time

like charges

Different charges

REPEL

ATTRACT

Radial field

As you move away from the sphere the feild gets weaker

negitive sphere, - out + in

plus sphere, -in +out

Charge is measured in

Coulombs

Current is the

measure of the movement of charge and is measured in amps (coulombs per second)

Ametre

measures how much charge is moving around a current

Voltmetre

measure of p.d this is the measure of energy a cells gives to the charge§

Resistor

Resistance is a measure of hoe hard it is for current to flow through a component , measured in ohms.

V=

IR

IV Graph filament bulb

Diode

Light dependant resistor

As the light intensity increases the resistance falls

IV experiment

Thermosistors

As temprature increases resistance falls

Ohmic resistor

LED graph

Series more bulbs=

more resistance

Parallel more bulbs =

more current and and less resistance

Resistance in series and NO. of bulbs

Not straight because bulbs are less bright and cold.

Resistance in parallel and NO. of bulbs

Series

resisatance can be added, current same everywhere, mpotential differences add to supply.

Parallel

Potential difference = same for all resistors, total current = all current added together.

Parallel Rtotal =

V/I total.

Using a LDR to measure light intensity

V =

E/Q E=energy Q=Charge

E=

QV

P=

E/T

I=

Q/T

Power=

I² x R