Current measurement

Ammeter

Measurement with an ammeter[edit | edit source]

Current meters are connected in series to the part of the circuit in which the current is to be measured. We increase the range of the ammeter by n-times if we place a resistance (n-1) times smaller than its own resistance in parallel in the circuit.

Compensation method[edit | edit source]

We can also perform the measurement using the the compensatory method: instead of the meter, we connect a certain known resistance, which reduces the voltage, which we measure with the help of a compensator and calculate the current value from the relation R=U/I. We measure very small currents using a galvanometer (sensitivity up to 10^-10A).

Links[edit | edit source]

External links[edit | edit source]

Source[edit | edit source]

KUBATOVA, Senta. Biofot [online]. [cit. 2011-01-31]. <https://uloz.to/!CM6zAi6z/biofot-doc>.