In this video I explain the concepts of current and charge in more detail using the rope loop model.

In a circuit, the cell or battery causes the flow of charged particles. These particles are called electrons and they have a negative charge. The rate of flow of these charged particles is the electric current. The more charged particles flowing past a point in the circuit in a given time, the greater the current.

It is important to note that while current is a measure of the rate of flow of electrons, which flow from negative to positive, the direction of conventional current is defined as flowing from positive to negative.

The symbol for current is I, which stands for intensity and the symbol for charge is Q, which stands for quantity. Hence the equation for current is I = Q/t where current is measured in amperes (A), charge in coulombs (C) and time is seconds (s).

Thanks for watching,

Lewis

Relevant for GCSE Physics 9-1 in the following exam boards:
AQA (including Trilogy)
Edexcel
CCEA
OCR A
OCR B
WJEC
CIE (Cambridge International Examinations) IGCSE
Edexcel International IGCSE

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