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When there is no current in a conductor, the free electrons move randomly.
When connected in an electrical circuit, electrons move only in one direction without random motion.
The drift speed of electrons in a conductor is very fast, often several meters per second.
Electrical conduction in metals is due to the movement of bound electrons.
Electric current is measured in amperes (A).
1 mA is equal to 0.001 A.
An ammeter is used to measure voltage in a circuit.
Digital ammeters are less versatile than analogue ammeters.
To measure the current in a component, the ammeter must be connected in series with it.
In a series circuit, the current varies at different points in the circuit.