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Worksheet: Potential Dividers

<^< Potential Dividers | Course Index | Current Divider >^>(:nl:)

Objective: To investigate the action of a potential divider circuit.
Underpinning knowledge: Resistance. Resistors in series. Kirchhoff's Voltage 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_' = 4k&#937;, R'_2_' = 1k&#937;.
Requires: Paper, Linear graph paper, pen or pencil.
Instructions:

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

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

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

Observations:

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

Further work:

(a) Devise a potential divider arrangement that would draw a current of 10mA from a 15V supply and produce an output voltage of precisely 5V. Check your answer using your circuit simulation package

(b) The output voltage produced by a potential divider arrangement will fall when the circuit is loaded (i.e. when current is drawn away from the circuit into a load resistance connected to it). Investigate the effect on the output voltage of your potential divider when connected to load resistance's of 50k&#937;, 10k&#937;, 5k&#937;, 1k&#937; and 500&#937;.

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