p2 Flashcards
the greater the resistance across a component…
…the smaller the current flows
what is a current
flow of electrical charge
what is potential difference
driving force that pushes charge around
formula for pd and current
pd = current x resistance
what can u use to investigate the factors affecting resistance
ammetre and voltmetre
what does a ammetre do
measure current in a series
what does a voltmetre do
measure potential difference
what does resistance do
slows the flow down
what do ohmic conductors have
constant resistance ( straight line on graph)
what does a filament look like on a graph
curvy line
what does diode look like on a graph
one line
how does the current flow through diode
in one direction
what is a variable resistor used for
alter current
what does the diode do?
only lets current flow in one direction
what are the 3 seperate wires and there colours
live wire( brown) , neutral wire (blue) , earth wire ( yellow and green )
