PHYSICS P2 (circuits) , prallel,series

RATE what does it mean?

per unit time

unit for resistance

ohms

POTENTIAL DIFFERENCE what is it?

measure of the electrical work done (J) for every coulomb of charge that flows through a component

what is POTENTIAL DIFFERENCE measured in?

(v) volts

E ?

energy (J)

Q ?

charge (coloumbs)

V ?

(volts)

ohms law ?

current through a resistor is directly proportional to the potential difference across the resistor

formula for PD ?

v = IR

V = IR ?

potential difference = current x resistance

if the charge increases by 2 how much will current increase by ?

2

in a voltmeter how is PD shared ?

it is shared equally

PD in a parallel circuit?

across each branch the pd is the same and is equal to the cell voltage

current in a parallel circuit?

current splits at a junction means that the sum of all the current through each branch equals the total current.

PD in a series circuit?

the potential difference splits between components

current in a series circuit?

the current is the same through each component

what do use to measure current?

ammeter

what do you use to measure potential difference?

voltmeter

what does LDR stand for?

light dependant resistor

rule for light intensity in LDR

as the light intensity increases the resistance of the LDR decreases.

as the light intensity decreaes the resistance of the LDR increases.