Worksheet Flashcards
An atom is electrically neutral, or ____ when it has an equal number of protons and electrons.
Balanced
An atom that gains or loses an electron is called a…?
Ion
This type of ion has one more proton than electrons and the atom has a positive charge.
Positive Ion
This type of ion has one more electron than protons and the atom has a negative charge.
Negative Ion
Materials that permit electrons to flow freely from particle to particle are known as ____.
Conductor
Nonconductive materials have very few free electrons and have high resistance to movement or electricity are called ____.
Insulator
Materials that are neither good conductors nor good insulators and have electrical characteristics that fall between those conductors and insulators are called ____.
Semiconductors
This term describes the force or electrical energy required to move electrons from one place to another.
Voltage
This term describes the movement of free electrons through a conductor and is measured in amperes.
Current
The ____ is a measure of the amount of electric charge passing a point per unit time and represents the flow of electrons in a conductor.
Amperes
The amount of opposition a device or material offers to the movement of electrons is known as ____.
Resistance
The term that is defined as the physical property of a circuit that opposes change to current flow.
Inductance
What is measured in watts and calculated by multiplying current times voltage?
Power
What is the unit of measurement for resistance?
Ohm
The unit of measurement for inductance is the _____.
henry
The following defines what?
The ability of a dielectric to store an electric charge.
Capacitance
The following defines what?
The opposition a device or material offers to the movement of electrons.
Resistance
The following defines what?
The tendency of an electrical conductor to oppose a change in the electric current flowing through it.
Inductance
The unit of measurement for capacitance is _____.
Farad
An atom with a different number of electrons and protons.
Ion
Particles that orbit around the nucleus in energy levels.
Electrons
The opposite of resistance.
Conductance
Movement of free electrons through a conductor.
Current
Neutral particle of an atom.
Neutron
Element that opposes conduction of electricity.
Insulator
Positively charged particle of an atom.
Proton
Opposition to the movement of electrons.
Resistance
Element that allows electrons to flow freely
Conductor
Rate of doing work
Power
Matter between conductors and insulators
Semiconductor
Difference of potential
Voltage
The center of an atom
Nucleus
List the four major wave shapes:
Sawtooth, rectangular, square and sine
The unit of measurement of the number of cycles per second is
Hertz (Hz)
Peak amplitude of an AC sine wave refers to
peak voltage
Current which is constantly changing in amplitude and periodically reversing polarity.
AC
Two sine waves that rise and fall through zero reference at the same time.
In-phase
Two sine waves that do not pass through the zero reference at the same.
Out-of-phase
Maximum amplitude of current or voltage
Peak-to-peak
360 degrees of a sine wave
Cycle
The stationary magnetic field
Stator
Coils of wire wrapped around a metal core on a rotating shaft
Rotor
The effective value of a sine wave of voltage or current will do the same amount of work as…?
DC voltage
The phase relationship of two sine waves, one at 0 degrees and the other at its peak negative value at the same time, is…?
out of phase
RF is an abbreviation for…?
Radio Frequencies
What are the microwave frequencies?
1 GHz to 300 GHz
The two most common AC power frequencies throughout the world are ___ and ___.
50Hz
60Hz
What factors affect capacitance?
- Dielectric constant (k)
- Plate Area (A)
- Distance between plates (d)
What is the formula for capacitance (C)?
If you increase the size of the capacitor plates the capacitance will…?
increase
The capacitance of a capacitor is directly proportional to ___ and ___, however inversely proportional to the ____.
- Dielectric constant (k)
- Plate Area (A)
- Distance between plates (d)
What factors affect inductance?
- Number of turns in the coil
- Core cross sectional area
- Length of the coil
- Type of core material
Inductance will increase when you increase either the number of ___, the cross sectional area of the ____, or the ____ of the core.
turns
core
permeability
Inductance is ____ proportional to the length of the coil.
inversely
Define the term resistance
The opposition to the flow of current a resistor creates
Distance in meters of one cycle
wavelength
a symmetrical non sinusoidal wave with equal alternations
square
moveable coil in a generator
rotor
frequency range from 3KHz-300Gz
radio
The amount of AC voltage that will do the same amount of work as a DC voltage
RMS
Frequency range from 15-20KHz
audio
Also known as ramp voltage
sawtooth
frequencies include infrared, visible and ultraviolet
optics
when two sine waves of the same frequency pass through zero and reach their positive peaks at the same time, they are…?
in phase
distance from zero to highest or lowest point on a sine wave
peak
frequency range extends from 10^23HZ
x-ray
