Title: M1L1 Circuit Basics Practice
Course: ELEC 160WH Introduction to Electricity/Electronics > Section: ELEC 160WH Introduction to Electricity/Electronics

Q: The simplest complete circuit requires a ___________________________.
- source/potential difference (example: battery), conductive pathway (example: wire), a load or resistance (like a bulb or heating element)
- source/current flow (example: battery), charge (example: electrons built up on a terminal), and direction (DC)
- current, terminals, shorted pathway
- None of the above
A: source/potential difference (example: battery), conductive pathway (example: wire), a load or resistance (like a bulb or heating element)

Q: There are many power sources that have a fixed polarity.  These devices are called DC or _____________ sources since the current they produce flows only in one direction.
- direct current
- dual conductor
- double coulomb
- double current
A: direct current

Q: With DC sources, current always flows from ____________________.
- negative to positive
- positive to negative
- negative to negative
- positive to positive
A: negative to positive

Q: Mass flow of electrons will occur through path/s of least ____________.
- conductance
- resistance
- voltage
- distance
A: resistance

Q: Metal is a good conductor because it has __________.
- few valence electrons in the outer shell
- four valence
- eight valence
- no valence
A: few valence electrons in the outer shell

Q: An insulator does not conduct electrons (electricity).  Which below is a good insulator? (Check all correct answers.)
- Glass
- Plastic
- Steel
- Saline
A: Glass; Plastic

Q: A resistor is a specific device having a specifically manufactured resistance.  Resistors reduce electron current flow and divide voltage sources by transferring the electron flow energy into what form of energy?
- Light
- Heat
- Electrical
- Magnetic
A: Heat

Q: Resistance (R) is measured in __________.
- Amperes (A)
- Watts (W)
- Joules (J)
- Ohms (Ω)
A: Ohms (Ω)

Q: Current is abbreviated (I) and it is measured in ____________.
- Watts (W)
- Joules (J)
- Amperes (A)
- Volts (V)
A: Amperes (A)

Q: Time is abbreviated (t) and it is measured in __________.
- feet
- grams
- liters
- seconds
A: seconds

Q: Current is the rate of electron flow. One ampere (1A) is equal to _____________________________.
- 1 coulomb of charge passing a point every second
- 1 charge per hour
- 1 joule per second
- 1 watt per ohm
A: 1 coulomb of charge passing a point every second

Q: The potential difference, or voltage, indicates how “badly” _________ at the negative terminal “want” to get to the _________ terminal.
- protons, positive
- positrons, nucleus
- electrons, positive
- electrons, negative
A: electrons, positive

Q: A 9V battery has _________ 1.5V cells in series.
- six
- nine
- twelve
- three
A: six

Q: __________ within a conductor are coerced into flowing from their respective atoms at the speed of light when placed between a potential difference of electrons.  However, the electrons themselves usually migrate through the wire slower than a human runner.
- Atoms
- Electrons
- Protons
- Photons
A: Electrons

Q: The atom shown below belongs to the element ____________.

Its atomic number is ____________.

This atom has ______ electrons in its outer shell.

This element is a/n __________.
- Oxygen, 8, 6, insulator
- Silicon, 14, 4, semiconductor
- Copper, 29, 1, conductor
- Sodium, 26, 1, conductor
A: Copper, 29, 1, conductor

Q: Most insulators used are complex compounds, such as _________________.
- glass
- polyethylene
- porcelain
- all of the above
A: all of the above

Q: The more conductive the path is between a voltage source’s terminals, the more the resultant current.
- True
- False
A: True

Q: A purely conductive path (no resistance) between a source’s positive and negative terminals will allow electrons to flow freely in mass quantity.  If a battery had such a purely conductive pathway across its positive and negative terminals, it would be discharged too quickly and could be destroyed.
- True
- False
A: True

Q: Which figure above shows us the most basic complete circuit?
- Figure “a.”
- Figure “b.”
- Figure “c.”
- Figure “d.”
- All of the above
- None of the above
A: Figure “c.”

Q: Potential difference (voltage) is how “badly” the excess electrons “want” to get from the negative terminal to the positive terminal.  A real-life example of a potential difference would be  ________________.
- a battery
- a resistor
- a conductor
- an LED
A: a battery

Q: Electron flow results when a ______________ is placed between the potential difference’s negative and positive terminals.
- complete pathway
- load/s
- All of the above
A: All of the above

Q: The electrical pathway needs to have a resistance or load for the source to “power.”  A real-life example of a load could be a ______.
- heating element
- motor
- light bulb
- speaker
- All of the above
A: All of the above

Q: Once a complete path has been created, electrons flow is _______ proportional to current.  That is to say, the more resistance the path has, the fewer electrons will flow through it from negative to positive.  This relationship is shown mathematically in ______ law.
- inversely, Ohm’s
- directly, Volta’s
- inversely, Moore’s
- directly, Ohm’s
A: inversely, Ohm’s

Q: A resistor is a specific electrical component used to limit current and divide voltages.  They are manufactured in a variety of specific resistances (measured in Ohms).
- True
- False
A: True

Q: A semiconductor, specifically a light emitting diode (LED), needs to have its current limited.  Otherwise, it will draw too much flow from the source and would eventually burn up internally.  The current through the semiconductor device can be limited by a resistor in series with it (see above diagram).  If the LED’s voltage drop (a constant) is 1.5V and the source is 12V, what size resistor would be needed to limit the current through it to 18.75mA (0.018,75A)?

Assuming the resistor has a tolerance of 5%, what should its color code be?
- 720Ω, Violet-Red-Brown-Gold
- 560Ω, Green-Blue-Brown-Gold
- -788Ω, Violet-Grey-White-Gold
- 0.560Ω, Green-Blue-Grey-Gold
A: 560Ω, Green-Blue-Brown-Gold