Whether we are measuring amperes, milliamperes, or micro-amperes, two important facts and methods for measuring of current to remember are:
- The current meter must be in series in the circuit where the current is to be measured. The amount of deflection depends on the current through the meter. In a series circuit, the current is the same through all series components. Therefore, the current to be measured must be made to flow through the meter as a series component in the circuit.
- A DC meter must be connected in the correct polarity for the meter to read up-scale. Reversed polarity makes the meter read down-scale, forcing the pointer against the stop at the left, which can bend the pointer.