<^< Impedance | Course Index | Assessment: Fundamentals >^>
| Objective:
| To investigate the action of a C-R series circuit when connected to an a.c. supply
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| Underpinning knowledge:
| Alternating current and voltage. Capacitive reactance.Impedance. Ohm's Law.
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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:
| C = 10µF, R = 1kΩ, a.c. Supply of 10V at 200Hz
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| Requires:
| Paper, Linear graph paper, pen or pencil.
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| Instructions:
(a) Using initial settings determine Z from Z = V/I.
(b) Calculate the impedance of the circuit, Z, from Z = √(R2 + X2) where X = 1/(2π f C)
(c) Compare the results from (a) and (b) (they should be the same!)
(d) Change the frequency of the a.c. Supply from 100Hz to 200Hz.
(e) Repeat steps (a) to (c).
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Observations:
Confirm that Z = V/I = √(R2 + X2) at both 100Hz and 200Hz
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| Further work:
Determine the value of capacitance that would produce an impedance of 1.41kΩ at 100Hz when connected in series with a 1kΩ resistor. Check your answer using your circuit simulation software.
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<^< Impedance | Course index | Assessment: Fundamentals >^>
