electricity/electronics

Question 1

potential difference

Answer 1

• also known as voltage and electromotive force
• measure the electrical pressure that forces electrons through a system
• unit is Volts

Question 2

current

Answer 2

measure quantity of electrons flowing per second
- ampere or amp A
- direct or alternating AC or DC
- batteries are DC
- main power in AC
eg power point in house

Question 3

resistance

Answer 3

measure of the opposition of current flow
- some materials are good conductors, having low resistance and some are insulators which have high resistance
- measured in ohms

Question 4

ohms law

Answer 4

E = IR
or
V = IR

Question 5

electrical safety

Answer 5

• safety switch
• internal earthing — double insulated
• auto off feature
• insulators on cord — flexible fabric that doesn’t melt if touched by iron
• producer follow Aus standards to manufacture

Question 6

voltage

Answer 6

pressure from electrical circuit’s power source that pushes charged electrons through conducting loop