Please provide me the solutions for the specified questions. Thanks in advance :

Question

Please provide me the solutions for the specified questions. Thanks in advance :)

Text Book: Renewable and Efficient Electric Power Systems (Chapter1- 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8)

1.2. A voltage source produces the square wave shown below. The load, which

is either an ideal resistor, capacitor or inductor, draws current current as

shown below.

t

0 t

1

-1

1

Load

+

-

i (t )

v (t )

i (t )

v (t )

Figure P1.2

a. Is the “Load” a resistor, capacitor or inductor?

b. Sketch the power delivered to the load versus time.

c. What is the average power delivered to the load?

1.3. A single conductor in a transmission line dissipates 6,000 kWh of energy

over a 24-hour period during which time the current in the conductor was

100 amps. What is the resistance of the conductor?

1.5 The resistance of copper wire increases with temperature in an approximately

linear manner that can be expressed as

RT 2 = RT 1[1 + a(T2 - T1)]

where a = 0.00393/?C. Assuming the temperature of a copper transmission

line is the same as the ambient temperature, how hot does the weather have

to get to cause the resistance of a transmission line to increase by 10%

over its value at 20?C?

1.8. Consider the problem of using a low-voltage system to power a small

cabin. Suppose a 12-V system powers a pair of 100-W lightbulbs (wired

in parallel).

a. What would be the (filament) resistance of a bulb designed to use 100 W

when it receives 12 V?

b. What would be the current drawn by two such bulbs if each receives a

full 12 V?

c. What gage wire should be used if it is the minimum size that will carry

the current.

d. Suppose a 12-V battery located 80-ft away supplies current to the pair

of bulbs through the wire you picked in (c). Find:

1. The equivalent resistance of the two bulbs plus the wire resistance

to and from the battery.

2. Current delivered by the battery

3. The actual voltage across the bulbs

4. The power lost in the wires

5. The power delivered to the bulbs

6. The fraction of the power delivered by the battery that is lost in

the wires.

Explanation / Answer

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