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Worksheets8-27 AC Theory & Electromagnetism Recap
Total questions: 31
Worksheet time: 5hrs 10mins
Diagram shows a waveform displayed on the screen of a C.R.O. If the controls on the C.R.O. are set at 1 V/div and 2 s/div, find the peak voltage.
4 V
5 V
2 V
6 V
Diagram shows a trace on the screen of a C.R.O. when a signal is connected across the Y-input. What type of signal is shown here?
alternating current
frequency
sine wave
direct current
This is the graph of:
AC voltage
DC voltage
linear
quadratic
definition of frequency:
the distance between rest and crest
the amount of time that it takes to complete one wave cycle
The number of complete wave cycles per second.
the distance between crest-to-crest
The time it takes for a wave to complete one full cycle is known as the:
voltage
seconds
voltage
The height of a wave from the center (or zero line) is called the _________.
Vp
Vpp
frequency
Examine the picture. What is the period of 1 wavelength?
8 seconds
1/8 sec
1/8 Hz
8 Hz
Examine the picture: What is the frequency of one wave?
8 sec
1/8 Hz
8 Hz
1/8 sec
What is the Vpp (Voltage peak to peak) of this wave?
10 mm
5 mm
15 mm
20 mm
What is the frequency of a typical AC power supply?
What device is used to generate AC waveforms?
Function Generator
Battery
The units for amplitude are:
Seconds
The units for period are:
Volts
Hertz
Ohms
Period and frequency are ____________ of each other.
inverses
They will repel each other.
What will the magnets in the picture do?
Attract each other
Repel each other
Both attract and repel
Neither attract nor repel
The area of magnetic force around a magnet is known as its _____________.
magnetic field
pole fields
magnetic fan lines
pole lines
take away the battery
Adding a second battery to an electromagnet will _____.
decrease the resistance in the wire
decrease the magnetism in the wire
increase the current flowing through the wire
decrease the current in the wire
As the number of turns on an electromagnet is decreased, the pole strength of the electromagnet
Decreases
Increases
Remains the same
Which of these bests describes an electromagnet?
A permanent magnet made from electric currents.
A temporary magnet made from electric currents.
A temporary magnet made from magnetic currents.
Which of the following will increase the strength of an electromagnet?
Increase the voltage of the battery
Decrease the voltage of the battery
Wrap the coils around the core less times
