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Fundamental Properties of AC Circuits/Lab

# Inductance

1. Calculate the inductance of a coil that induces 120V when the current through it changes at a rate of 5A/s.
2. Calculate the inductance of a coil that induces 850V when the current through it changes at a rate of 30mA in 2µs.
3. Given an iron core with 200 turns, a length of 0.35m and an area of 3×10-4m2, determine the inductance.
4. A 10:1 transformer has NP = 300, VP = 240V and IP = 2A.Determine NS, VS, and Is.
5. Four inductors of values 6mH, 7mH, 9mH, and 10mH are connected in series.Determine the total inductance.
6. Four inductors of values 6mH, 7mH, 9mH, and 10mH are connected in parallel.Determine the total equivalent inductance.
7. Calculate the energy store in a 20mH inductor with a current of 3mA flowing through it.

# Transformers

1. Watch the videos
• Week 4 Video Lecture – Multisim Transformers
2. Consider the circuit demonstrated in this week’s presentations. With the turns ratio modified to 20:1, calculate the following values of Vs and Is for the given values of RL in the table below:
 RL Calculated Vs Calculated Is Measured Vs Measured Is 0 Ω 10 Ω 25 Ω 50 Ω 100 Ω 1000 Ω
3. 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 RL. Use the Agilent Digital Multi-meter to take the measurements and capture a screen shot of each measurement.
4. Discuss the following:
1. Describe the relationship of RL on the secondary voltage.
2. Describe the relationship of RL on the secondary current.
3. How do the calculated values compare to the measured values?
4. How would you go about calculating the transformer power efficiency?
5. How would you go about measuring the transformer power efficiency?
6. Determine the transformer power efficiency for the circuit in MultiSIM. Include a calculation and a measured value.

Include all calculations, screenshots of measurements, the table results of part 2 and the answers to part 4 in a word processing document