Current, charge and time

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

current=\frac{charge}{time}

Rearranging this we get:

charge = current \times time

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

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

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

This gives the relationship:

Q = I \times t

Example

Question

Calculate the charge that passes through a lamp in 2 minutes if the current is 1.5A?

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

charge = current \times time

Remember to convert minutes into seconds by multiplying by 60

Q = 1.5 \times (2 \times 60) = 180C