What is electric current?
The rate of flow of charge
What is potential difference?
The energy transferred per unit charge
What is resistance?
The opposition to current flow
What is electric current?
The rate of flow of charge
What is potential difference?
The energy transferred per unit of charge
What is resistance?
The opposition to current flow
What is the equation linking V, I and R?
V = I × R
Voltage = current × resistance
How can resistance be determined from a voltage- current graph?
Resistance is the gradient on the graph
What is a diode?
A component that allows current to flow in only one direction
What is an LED?
A diode that emits light when current flows through it
What is the equation for charge flow?
Q = I × T
Charge flow= current × time
What does Q represent in Q = I × T
Charge flow (coloumbs)
What is current measured in?
Ampmetres
What is time measured in?
Seconds
What is electrical power?
The ratio of useful energy output to total energy input
How do switches affect parallel circuits?
Opening one switch only stops current in that branch
