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How to use a Multimeter / Using Multimeters

Current Measurements Tutorial

Current measurements:

The diagram below shows a prototype board set up for the measurement of current:

Current measurements

Note that the current must flow through the ammeter in order to reach the circuit.

Take a reading of the current with the link wire to 0 V in position A. Write down the current value you observe:

A:

Take new readings after moving the link to positions B, C and D:

B:C:D:

Don't forget to write in the measurement units of your answer.

As the resistance is reduced, current increases. Calculate the current expected in each case using the formula:

Small variations, up to 5%, can be attributed to the tolerance of the resistors.

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