<^< Resistors in Parallel | Course Index | Resistance and Temperature >^>
Objective:
| To investigate resistors connected in parallel.
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Underpinning knowledge:
| Resistance. Preferred values. Parallel connections.
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Apparatus:
| TINA circuit file, or apparatus to make the following circuit.
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TINA Circuit File:
| Click here to download circuit file
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Initial Settings:
| R1 = 1kΩ, R2 = 2kΩ, R3 = 3kΩ.
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Requires:
| Paper, Linear graph paper, pen or pencil.
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Instructions:
(a) Using initial settings verify that 1/R = 1/R1 + 1/R2 + 1/R3.
(b) Change R1 to 15kΩ, R2 to 27kΩ and R3 to 33kΩ.
(c) Again check that 1/R = 1/R1 + 1/R2 + 1/R3.
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Observations:
Confirm that, in each case, the reciprocal of the effective resistance of the parallel combination of resistors is equal to the sum of the reciprocals of the individual resistance values.
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Further work:
Using only preferred value resistors in the E12 series, suggest how you could use a parallel combination of three fixed resistors to obtain the following values of resistance: 333Ω, 5Ω, and 3.75Ω. Check your answers using your simulation software.
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<^< Resistors in Parallel | Course index | Resistance and Temperature >^>