Residential Construction Academy Electrical Principles 2nd. Edition by Stephen L. Herman | 9781111306472 | 1111306478

Basic Electrical

Residential Construction Academy Electrical Principles

2 SOLVED PROBLEMS

64 SOLVED PROBLEMS

Question: 11.2

Can Type THHN insulation be used in wet locations? ...

Verified Answer:

Locate Type THHN insulation in the second column. ...

Question: 21.2

A capacitor is connected into a 480-V, 60-Hz circuit. An ammeter indicates a current flow of 2.6 A. What is the capacitance value of the capacitor? ...

Verified Answer:

The first step is to calculate the value of capaci...

Question: 7.2

Both of the preceding circuits were solved by first determining which parts of the circuit were in series and which were in parallel. The circuits were then reduced to a simple series or parallel circuit. This same procedure can be used for any combination circuit. The circuit shown in Figure 7-9 ...

Verified Answer:

The first step will be to reduce the top part of t...

Question: 9.9

Find the resistance of a piece of #6 AWG copper wire 550 ft long. Assume a temperature of 20°C. The formula to be used is R = K × L/CM ...

Verified Answer:

The value for K can be found in the table in Figur...

Question: 12.3

An inductor with negligible resistance is connected to a 480-V, 60-Hz line. An ammeter indicates a current flow of 24 A. How much current will flow in this circuit if the frequency is increased to 400 Hz? ...

Verified Answer:

The first step in solving this problem is to deter...

Question: 13.1

Two resistors and two inductors are connected in series (Fig. 13-29). The circuit is connected to a 130-V, 60-Hz line. The first resistor has a power dissipation of 56 W, and the second resistor has a power dissipation of 44 W. One inductor has a reactive power of 152 VARs and the second a reactive ...

Verified Answer:

The first step is to find the total amount of true...

Question: 14.1

In this circuit, one resistor is connected in parallel with two inductors (Fig. 14-11). The frequency is 60 Hz. The circuit has an apparent power of 6120 VA, the resistor has a resistance of 45 Ω, the first inductor has an inductive reactance of 40 Ω, and the second inductor has an inductive ...

Verified Answer:

Impedance Before it is possible to compute the imp...

Question: 6.2

In the circuit shown in Figure 6-15, three resistors are connected in parallel. Two of the resistors have a value of 900 Ω and 1800 Ω. The value of resistor R2 is unknown. The total resistance of the circuit is 300 Ω. Resistor R2 has a current flow of 0.2 A. Find the missing circuit values. ...

Verified Answer:

The first step in solving this problem is to find ...

Question: 6.3

In the circuit shown in Figure 6-19, three resistors are connected in parallel. Resistor R1 is producing 0.075 W of heat, R2 is producing 0.45 W of heat, and R3 is producing 0.225 W of heat. The circuit has a total current of 0.05 A. ...

Verified Answer:

Since the amount of power dissipated by each resis...

Question: 7.1

Solve the combination circuit shown in Figure 7-5. ...

Verified Answer:

The first step in finding the missing values is to...

Question: 15.3

How long will it take the capacitor shown in Figure 15-15 to charge if it has a value of 50 µF and the resistor has a value of 100 kΩ? ...

Verified Answer:

τ

= R × C [late...

Question: 15.8

An AC oil-filled capacitor has a voltage rating of 300 WVDC. Will the voltage rating of the capacitor be exceeded if the capacitor is connected to a 240-V, 60-Hz line? ...

Verified Answer:

The DC voltage rating of the capacitor indicates t...