A series of free GCSE/IGCSE Physics Notes and Lessons.
Charge and Current
The following diagram gives the formula for charge and current. Scroll down the page for more examples and solutions on how to use the formula.
In these lessons, we will
• Calculate the charge flow in a circuit.
• Describe what is meant by an electric current.
• Calculate charge from current or current from charge.
Electric charge is measured in Coulombs (C).
A current of 1 Ampere = 1 Coulomb of charge flowing per second.
The size of the electric current is the rate of flow of the electrical charge.
Q = I × t
Electric charge and current
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