Current is not used up, what flows into a component must flow out.
We say current through a component.
Current is measured in amps (amperes), A.
Current is measured with an ammeter, connected in series. To connect in series you must break the circuit and put the ammeter acoss the gap, as shown in the diagram.
The symbol I is used for current in equations.
1A (1 amp) is quite a large current for electronics, so mA (milliamps) are often used. m (milli) means "thousandth":
1mA = 0.001A, or 1000mA = 1A
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