Assignment 6

Short Answer Questions

Answer the following questions as completely as possible.

1. Describe the effects of load resistance on the operation of a loaded voltage divider.

2. Describe the construction of a variable voltage divider.

3. Discuss the effects of voltmeter loading on circuit measurements.

4. Describe the use of a Wheatstone bridge as a resistance measuring device and as a sensing device.

Problems

Complete the following problems. Show all work.

1. Determine the value of load power (PL) for the circuit shown in the following figure (Fig. 6.48b).

2. Perform a Δ-to-Y conversion on the circuit shown in the following figure (Fig. 6.54b).

3. Perform a Y-to-Δ conversion on the circuit shown in the following figure (Fig. 6.54d).

Assignment 7

1. Explain how to use the superposition theorem to solve multisource circuits.

2. Explain the difference between an ideal and a practical voltage or current source.

Problems

Complete the following problems. Show all work.

1. Determine the values of V1 through V4 for the circuits shown in the following figure (Fig. 7.43b).

2. Calculate the maximum possible load power for the circuit shown in the following figure (Fig. 7.50b).

3. Using the Norton equivalent for the circuit shown in the following figure, determine its normal range of load current values (Fig. 7.55b).

4. Derive the current source equivalent of the voltage source shown in the following figure (Fig. 7.45d). Then, calculate the values of IL produced by each circuit for values of RL = 180 Ω and RL = 1 Ω.

5. Derive the voltage source equivalent of the current source shown in the following figure (Fig. 7.46b). Then, calculate the values of VL produced by each circuit for values of RL = 75 Ω and RL = 150 Ω.

Assignment 8

1. List the units of measurement for magnetic flux, flux density, MMF, and magnetic field strength.

2. Discuss the domain theory as the source of magnetism.

3. Describe the current and number of turns as it relates to an electromagnet.

4. Discuss the relationships among MMF, ampere-turns, coil current, permeability, and flux density.

5. Discuss hysteresis as it applies to magnetic cores.

6. Describe the proper care and handling of magnets.

Problems

Complete the following problems. Show all work.

1. Calculate the flux density for the shaded area in the following figure (Fig. 8.27b). Assume that each line of force represents 200 μWb flux.

2. A magnet with a cross-sectional area of 3 cm2 generates 1200 μWb of flux at its poles. Calculate the flux density at the poles of this magnet.

3. Calculate the flux density produced by the coil shown in the following figure (Fig. 8.28b).

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Attachment:- Assignments.rar