4.2.1.2 Electrical charge and current

Conditions for charge to flow

Circuit must be closed (no open switches)

There must be a source of potential difference (battery/ cell)

What is electric current

The rate of flow of charge

What does a greater flow of charge mean for current

Greater current

Equation for current, charge and time

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charge fow = current × time

Q =It
charge flow, Q, in coulombs, C
current, I, in amperes, A (amp is acceptable for ampere)
time, t, in seconds, s

What is charge

A measure of the total current that flowed within a certain period of time

coulombs, c

equation for energy transferred, charge flow and potential difference

E= QV

energy transferred= charge x voltage

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