Week 1, Chapter 1 - Principles of Electricity Flashcards
The general name given to every substance in the physical universe is ________.
Matter
The smallest part of an element that retains all of its characteristics is ________.
Atom
The particles that orbit around the center of an atom are called ________.
Electrons
Electrons carry which type of charge; positive or negative?
Negative
Technician A says that electromagnetic induction is the production of electricity when a current is carried through a conductor and a magnetic field is produced. Technician B says current flowing through a conductor such as a copper wire creates a magnetic field surrounding the wire. Which technician is correct?
Both Technicians A and B
Which of the following methods can calculate circuit current?
a. Multiplying amps times ohms
b. Dividing ohms by volts
c. Dividing volts by ohms
d. Multiplying volts times watts
c. Dividing volts by ohms
What causes voltage drop in a circuit?
Increase in resistance
Which of the following is a measure of electrical current?
a. Amperes (Amps)
b. Ohms
c. Voltage
d. Watts
a. Amperes (Amps)
A material with many free electrons is a good ________.
Conductor
A material with FOUR electrons in the valence ring is a ________.
Semiconductor
The CONVENTIONAL (grandpa’s method) theory of current flow says that current flows from ________ to ________.
Positive, Negative
Voltage is which of these items?
a. Applied to a circuit
b. Flowing in a circuit
c. Built into a circuit
d. Flowing out of a circuit
a. Applied to a circuit
The unit that represents RESISTANCE to a current flow is ________.
Ohm
Which of the following characteristic does NOT affect resistance?
a. Diameter of the conductor
b. Temperature of the conductor
c. Atomic structure of the conductor
d. Direction of current flow in the conductor
d. Direction of current flow in the conductor
The sum of the voltage drops in a circuit equals ________.
Source voltage
Which of the following is a measure of electrical pressure?
a. Amperes (Amps)
b. Ohms
c. Voltage
d. Watts
c. Voltage
Where E = volts, I = amperes, and R = resistance, how is Ohm’s law written?
E = I x R
Capacitors are also called ________.
Condensers
The lines of force of a magnet are called ________.
Flux lines
The motor principle of changing electrical energy into mechanical energy requires two ________ carrying current in ________ direction(s).
Conductors, Opposite
All of the following will increase voltage, except:
a. Increase the strength of the magnetic field
b. Increase the number of conductors cutting flux lines
c. Increase the angle between the flux lines and the conductor beyond 90 degrees
d. Increase the speed of the relative motion between the conductor and the flux lines.
c. Increase the angle between the flux lines and the conductor beyond 90 degrees.
Diodes bring together what 2 types of material?
P type and N type
Capacitors and Condensers are what type of device?
Energy storage
Adding ________ to silicon to increase conductivity is known as ________.
Impurities, Doping
For current to flow through a diode, the diode must have a ________ bias.
Forward
In reference to magnetism, ________ attract and ________ repel.
Opposites, Likes
The ratio of pulse width to signals period that is always expressed as a percentage is known as what?
Duty cycle
The number of times a wave repeats per second is known as what?
Frequency
Simply defined, ELECTRICITY is known as the ________ of ________.
Flow, Electrons
For a diode to have forward bias, the “cathode” must face which direction?
Negative
