AC Final - All Review Questions and answers graded
A+ latest update
1. What determines the polarity of
magnetism when current flows through The direction of the current flow
a conductor?
2. What determines the strength of the magnet- The amount of current
ic field when current flows through a
conduc- tor
3. Name three factors that determine 1) Number of turns of wire
the amount of induced voltage in a
coil. 2) Strength of the magnetic field
3) Speed of the cutting action
between the MF and the
4. How many lines of magnetic flux must be conductor
cut in 1 second to induce a voltage of 1
volt? 100 million (1 weber)
5. What is the effect on induced
voltage of adding more turns of wire
to a coil? It adds to the induced voltage
6. Into how many time constants is an exponen- 5
tial curve divided?
7. Each time constant of an exponential 63.2%
curve is equal to what percentage of the
maximum amount of charge?
8. An inductor has an inductance of 0.025H
and a wire resistance of 3Ω. How long will
it take the current to reach its full Ohm's 41.7 ms
Law value?
9. You have a DC Parallel circuit with 1
resis- tor and 1 inductor. Assume that the
inductor has a wire resistance of 0.2Ω 751V
and the resis- tor has a value of 250Ω. If
a current of 3A is
,AC Final - All Review Questions and answers graded
A+ latest update
flowing through the inductor, what will be
the maximum induced voltage when the
switch is opened?
10. What electronic component is often used Diodes (or Metal Oxide
to prevent large voltage spikes from
being pro- duced when the current flow Varistors, but Julie says they are
through an in- ductor is suddenly expensive)
terminated?
11. Which trigonometric function is used to
find the angle if the length of the
hypotenuse and the adjacent side are Cosine
known?
12. Pic - If side A has a length of 18.5ft and side B 33.6
ft has a length of 28ft, what is the length of
the hypotenuse?
13. Pic - Side A has a length of 12m, and 2.55 m
angle Y is 12 degrees. What is the length
of side B?
14. Pic - Side A has a length of 6in, and 8.48 in
angle Y is 45 degrees. What is the
length of the hy- potenuse?
15. Pic - The hypotenuse has a length of 65 in, and 48.5 degrees
side A has a length of 31 in. What is angle X?
16. Pic - The hypotenuse has a length of 83 ft and 80.0 ft
side B has a length of 22 ft. what is the
length of side A?
17. Pic - Side A has a length of 1.25 in, and 58.0 degrees
side B has a length of 2 in. What is angle
Y?
,AC Final - All Review Questions and answers graded
A+ latest update
18. Pic - Side A has a length of 14 ft, and 16.0 ft
angle X is 61 degrees. what is the length
of the hy- potenuse?
19. Pic - Side A has a length of 14 ft, and angle X is 7.76 ft
61 degrees. what is the length of the side B?
20. Angle Y is 36 degrees. What is angle X? 54.0 degrees
21. What is the most common type of AC Sine wave
wave- form?
22. How many degrees are there in one complete 360 degrees
sine wave?
23. At what angle does the voltage reach its max- -270 degrees
imum negative value on a sine wave?
24. What is frequency? The number of complete cycles of
AC voltage that occur in 1
second
25. A sine wave has a maximum value of 142 V
230V. What is the voltage after 38
degrees of rota- tion?
26. A sine wave has a voltage of 63V after
22 degrees of rotation. What is the
168V
maximum voltage reached by this
waveform?
27. A sine wave has a maximum value of 560V. At 12.9 degrees
what angle of rotation will the voltage
reach a value of 123V?
28. 306V
A+ latest update
1. What determines the polarity of
magnetism when current flows through The direction of the current flow
a conductor?
2. What determines the strength of the magnet- The amount of current
ic field when current flows through a
conduc- tor
3. Name three factors that determine 1) Number of turns of wire
the amount of induced voltage in a
coil. 2) Strength of the magnetic field
3) Speed of the cutting action
between the MF and the
4. How many lines of magnetic flux must be conductor
cut in 1 second to induce a voltage of 1
volt? 100 million (1 weber)
5. What is the effect on induced
voltage of adding more turns of wire
to a coil? It adds to the induced voltage
6. Into how many time constants is an exponen- 5
tial curve divided?
7. Each time constant of an exponential 63.2%
curve is equal to what percentage of the
maximum amount of charge?
8. An inductor has an inductance of 0.025H
and a wire resistance of 3Ω. How long will
it take the current to reach its full Ohm's 41.7 ms
Law value?
9. You have a DC Parallel circuit with 1
resis- tor and 1 inductor. Assume that the
inductor has a wire resistance of 0.2Ω 751V
and the resis- tor has a value of 250Ω. If
a current of 3A is
,AC Final - All Review Questions and answers graded
A+ latest update
flowing through the inductor, what will be
the maximum induced voltage when the
switch is opened?
10. What electronic component is often used Diodes (or Metal Oxide
to prevent large voltage spikes from
being pro- duced when the current flow Varistors, but Julie says they are
through an in- ductor is suddenly expensive)
terminated?
11. Which trigonometric function is used to
find the angle if the length of the
hypotenuse and the adjacent side are Cosine
known?
12. Pic - If side A has a length of 18.5ft and side B 33.6
ft has a length of 28ft, what is the length of
the hypotenuse?
13. Pic - Side A has a length of 12m, and 2.55 m
angle Y is 12 degrees. What is the length
of side B?
14. Pic - Side A has a length of 6in, and 8.48 in
angle Y is 45 degrees. What is the
length of the hy- potenuse?
15. Pic - The hypotenuse has a length of 65 in, and 48.5 degrees
side A has a length of 31 in. What is angle X?
16. Pic - The hypotenuse has a length of 83 ft and 80.0 ft
side B has a length of 22 ft. what is the
length of side A?
17. Pic - Side A has a length of 1.25 in, and 58.0 degrees
side B has a length of 2 in. What is angle
Y?
,AC Final - All Review Questions and answers graded
A+ latest update
18. Pic - Side A has a length of 14 ft, and 16.0 ft
angle X is 61 degrees. what is the length
of the hy- potenuse?
19. Pic - Side A has a length of 14 ft, and angle X is 7.76 ft
61 degrees. what is the length of the side B?
20. Angle Y is 36 degrees. What is angle X? 54.0 degrees
21. What is the most common type of AC Sine wave
wave- form?
22. How many degrees are there in one complete 360 degrees
sine wave?
23. At what angle does the voltage reach its max- -270 degrees
imum negative value on a sine wave?
24. What is frequency? The number of complete cycles of
AC voltage that occur in 1
second
25. A sine wave has a maximum value of 142 V
230V. What is the voltage after 38
degrees of rota- tion?
26. A sine wave has a voltage of 63V after
22 degrees of rotation. What is the
168V
maximum voltage reached by this
waveform?
27. A sine wave has a maximum value of 560V. At 12.9 degrees
what angle of rotation will the voltage
reach a value of 123V?
28. 306V
