ES Flashcards
Definition of electric current
rate at which electric charge flows
Definition of potential difference
amount of energy needed to move a unit charge from one point to another
Definition of electrical resistance
measure of how much component opposes flow of electric current
In a series circuit, as the number of resistors increase, the effective resistance ________
Increases
What is the formula for total resistance in a series circuit
R=R1+R2+R3…Rn
In a parallel circuit, as the number of resistors increase, the effective resistance _______
Decreases
What is the formula for total resistance in a parallel circuit
1/R = 1/R1 + 1/R2 + 1/R3 … 1/Rn
In a series circuit, the effective resistance decreases as the number of resistors ______
Decreases
In a parallel circuit, the effective resistance increases as the number of resistors _________
Decreases
Definition of power
rate of energy transfer
Formula for power (watt)
Energy transferred (J)/ Time taken (S)
How to convert watt to kilowatt
kWh = W/1000
Colour of live wire
Brown
Colour of neutral wire
Blue
Colour of earth wire
green and yellow
What is the function of a fuse
It is a safety device that prevents excessive current flow
How does a fuse work
Any excessive current passing through the fuse will melt the wire. This creates an open circuit and switches off the appliance
Name of a blue wire
Neutral wire
Name of a brown wire
Live wire
