# Current, charge and time

Electrical current is defined by how much electric charge has been transferred per second, giving the following :

Rearranging this we get:

The symbol for charge is , it is measured in coulombs ( ).

The symbol for current is , it is measured in amperes ( ).

The symbol for time is , it is measured in seconds ( ).

This gives the relationship:

## Example

Question

Calculate the charge that passes through a lamp in 2 minutes if the current is ?

To calculate the charge, you need to use the following relationship:

Remember to convert minutes into seconds by multiplying by 60