p5 Flashcards
what do atoms do in a resistor as an electric current passes through?
they vibrate more
where does the energy come from that heats a resistor?
transferred by current
which wire is earthed at the substation near your home
neutral wire
type of current for:
mains electricity
battery
mains: alternating
battery: direct
what are mains plugs pins made of and why
brass, good conductor
what colour is each wire?
neutral- blue
earth- green and yellow
live-brown
what voltage are batterys and cells current usually at?
around 1.5V
what is the national grid?
system of cables and transformers that link electricity users to producers
why increase pd? (4)
reduce amount of current needing to flow so less resistance so less heating of wires so less energy wasted therefore more efficent
symbol for double insulated?
square with smaller square inside
what do short circuits allow?
large current flow
what is electrical power
rate at which electrical appliances transfer energy by electrical working
3 power equ?
current x pd
current2 x resistance
energy/time
variable resistor symbol?
rectangle with arrow diagonal going through upwards
what energy stores are there for transferring energy from battery to resistor
chemical battery to thermal of resistor
