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PotentialAndCurrentDividers /

Worksheet: Current Divider

<^< Current Divider | Course Index | Passive Time Variant Circuits >^>(:nl:)

Objective: To investigate the action of a Current divider circuit.
Underpinning knowledge: Resistance. Resistors in parallel. Kirchhoff's Current Law.
Apparatus: TINA circuit file, or apparatus to make the following circuit.

TINA Circuit File: Click here to download circuit file
Initial Settings: R'_1_' = 1k&#937;, R'_2_' = 4k&#937;.
Requires: Paper, Linear graph paper, pen or pencil.
Instructions:

(a) Using initial settings verify that I'_OUT_' = I'_IN_' x R'_1_'/(R'_1_'+R'_2_').

(b) Change R'_1_' to 2k&#937; and R'_2_' to 3k&#937;.

(c) Again check that I'_OUT_' = I'_IN_' x R'_1_'/(R'_1_'+R'_2_').

Observations:

Confirm that, in each case, the output current is the input current multiplied by the ratio of R'_1_' to (R'_1_' + R'_2_').

Further work:

(a) Devise a current divider arrangement that would drop a potential of 0.5V and produce a precise output current of precisely 0.1A from an input current of 2A. Check your answer using your circuit simulation software.

(b) The output current produced by a current divider arrangement will fall when the circuit is loaded (i.e. when a load resistance is connected to it). Investigate the effect on the output current of your current divider when connected to load resistance's of 0.1k&#937;, 0.5k&#937;, 1k&#937;, 5k&#937; and 10k&#937;.

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