Measurement of Current

Whether we are measuring amperes, milliamperes, or micro-amperes, two important facts and methods for measuring of current to remember are:

  1. 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.
  2. 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.

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