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Current measurements:
The diagram below shows a
prototype board set up for the measurement of current:
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:
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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. |
