Principles of Electric Circuits Conventional Current 10th. Edition by Floyd Thomas | 9781292358093 | 1292358092

Principles of Electric Circuits Conventional Current

355 SOLVED PROBLEMS

Question: 9.10

A series RC circuit has a resistance of 1.0 MΩ and a capacitance of 4.7 μF. What is the time constant? ...

Verified Answer:

\tau

= RC = (1.0 × 10

^{6}[/l...

Question: 21.8

In a certain Δ-connected balanced load, the line voltages are 250 V and the impedances are 50∠30° Ω. Determine the total load power. ...

Verified Answer:

In a Δ-connected system,

V_{Z}=V_{L}[/latex...

Question: 21.7

Determine the magnitude of the load currents and the line currents in Figure 21–28. ...

Verified Answer:

V_{Z a}=V_{Z b}=V_{Z c}=240  V

The ...

Question: 21.6

Determine the currents and voltages in the balanced load and the magnitude of the line voltages in Figure 21–26. ...

Verified Answer:

The load currents equal the specified line current...

Question: 21.5

Determine the load voltages and load currents in Figure 21–23, and show their relationship in a phasor diagram. ...

Verified Answer:

Using

V_{L}=\sqrt{3} V_{\theta}

(Eq...

Question: 21.4

In the Y-Y system of Figure 21–21, determine the following: (a) Each load current (b) Each line current (c) Each phase current (d) Neutral current (e) Each load voltage ...

Verified Answer:

This system has a balanced load

Z _{a}= Z _...

Question: 21.3

The three-phase Δ-connected generator represented in Figure 21–17 is driving a balanced load such that each phase current is 10 A in magnitude. When Iθa = 10∠30° A, determine the following: (a) The polar expressions for the other phase currents (b) The polar expressions for each of the line ...

Verified Answer:

(a) The phase currents are separated by 120°; ther...

Question: 21.2

The instantaneous position of a certain Y-connected ac generator is shown in Figure 21–12. If each phase voltage has a magnitude of 120 V rms, determine the magnitude of each line voltage, and draw the phasor diagram. ...

Verified Answer:

The magnitude of each line voltage is

V_{L}...

Question: 21.1

Compare the total copper cross sections in terms of current-carrying capacity for single-phase and three-phase 120 V systems with effective load resistances of 12 Ω. ...

Verified Answer:

Single-phase system : The load current is

I...

Question: 20.10

Determine the output voltage waveform for the RL differentiator in Figure 20–45. ...

Verified Answer:

First, calculate the time constant.

\tau=\f...