Frequently Asked Questions
Electricity is the flow of electric charge (usually electrons) through a conductor due to a potential difference.
Electric current is the rate of flow of charge through a conductor.
Ampere (A).
A current of 1 A flows when 1 coulomb of charge passes through a conductor in 1 second.
\(( I = \frac{Q}{t} \) where \(I\) = current, \(Q\) = charge, \(t\) = time.
It is the work done to move a unit charge between two points in an electric circuit.
Volt (V).
\( V = \frac{W}{Q} \)
A device used to measure potential difference in a circuit.
Always in parallel with the component.
A device used to measure current in a circuit.
Always in series with the component.
Resistance is the opposition offered by a conductor to the flow of electric current.
Ohm (O).
At constant temperature, the current through a conductor is directly proportional to the potential difference across it: ( V \propto I ).