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Transformers Sample Assignment

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1. The turns ratio modified to 20:1, calculate the following values of Vs and Is for the given values of RLin the table below:

Transformers img1 Transformers img2 Transformers img3

Transformers img4 Transformers img5 Transformers img6


Calculated Vs

Calculated Is

Measured Vs

Measured Is

0 Ω

120Vrms/20:1 = 6Vrms

6Vrms/0ohms= 0A



10 Ω

120Vrms/20:1 = 6Vrms

6Vrms/10ohms= 600mA



25 Ω

120Vrms/20:1 = 6Vrms

6Vrms/25ohms= 240mA



50 Ω

120Vrms/20:1 = 6Vrms

6Vrms/50ohms= 120mA



100 Ω

120Vrms/20:1 = 6Vrms

6Vrms/100ohms= 60mA



1000 Ω

120Vrms/20:1 = 6Vrms

6Vrms/1000ohms= 6mA



2. Construct the transformer circuit in MultiSIM and complete the table in part 2 with the measured values of Vs and Is for each value of RLUse the Agilent Digital Multi-meter to take the measurements and capture a screen shot of each measurement.

3. Discuss the following:

Transformers img7 Transformers img8 Transformers img9 Transformers img10 Transformers img11 Transformers img12
  • Describe the relationship of RLon the secondary voltage.

The secondary voltage equals RL times Is.

  1. Describe the relationship of RLon the secondary current.

    The secondary current equals secondary voltage divided by RL

  2. How do the calculated values compare to the measured values?

    Yes, although I can get a 0A when resistor equals 0 but when measuring I get –r- or overload reading.  Np/Ns = Vp/Vs.

  3. How would you go about calculating the transformer power efficiency?

    Efficiency = (Vs*Is)/(Vp*Ip)

  4. How would you go about measuring the transformer power efficiency?

    Put 2 wattmeter on both ends of the transformer (on the primary and on the secondary). Divide the output of power of primary by the input power of the secondary.

  5. Determine the transformer power efficiency for the circuit in MultiSIM. Include a calculation and a measured value. Transformers img13

    Efficiency = (Vs*Is)/(Vp*Ip)= (5.99*0.599)/(120*0.030) = (3.58/3.60)

    = 99.44% 

Include all calculations, screenshots of measurements, the table results of part 2 and the answers to part 4 in a word processing document and submit as EE115W4LabYourGID.docx, or an equivalent word processing file extension.

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