Section 1: Introduction to electricity

fundamentals of electrical

in what 3 forms can matter exist

Solid (ice cube)
Liquid (water)
Gas (steam)

An atom which has an excess of electrons

negative ion

what factor does not affect the resistance of a conductor

voltage rating

Approximate resistance of a 'short circuit'

zero ohms Ω

Approximate resistance of an 'open circuit'

maximum / infinity ohms Ω

2 effects which must always occur when electric current passes

heat and magnetism

direction of conventional current flow

positive + to negative -

current

the flow of electricity in an electronic circuit, and to the amount of electricity flowing through a circuit

symbol I

measured in amphere

voltage

pressure from an electrical circuit's power source that pushes charged electrons through a conducting loop, enabling them to do work

symbol V

measured in volts

resistance

a force that counteracts the flow of current

symbol Ω

measured in ohms

cross-sectional area

larger the area results in having the least resistance

types of conductors

copper
aluminium
brass
nichrome
carbon
mild steel
silver
tap water
sea water

types of insulators

pvc
glass
porcelain
rubber
air
bakelite
transformer oil
mica

what electrical source does a battery provide

pressure

what is potential difference

difference in voltage pressure between two bodies

electrons flowing creates...

electrical potential