Electrical current

• Current is the rate of flow of charge.
• The symbol for current is I.
• The current can be measured using an ammeter.

Units

• The unit of current is the ampere (A).
• 1 ampere is equal to 1 coulomb of charge passing through a point in 1 second.

Current equation - charge and time

\text{current} = \frac{\text{change in charge}}{\text{change in time}}

I=\frac{\Delta Q}{\Delta t}

Current equation - voltage and resistance

\text{current} = \frac{\text{voltage}}{\text{resistance}}

I=\frac{V}{R}