Flashcards
EXAM 2
Flashcards do conjunto (16)
- 1Explain the difference between Alternating and Direct CurrentDirect current, the electric charge (current) only flows in one direction.
Current and Voltage in Alternating current, on the other hand, changes direction periodically. - 2What is the relationship and difference between Energy and Power?Power is the rate of work done. *amount of energy consumed per unit of time* (Joule per unit of time)
Energy is the capacity for doing work. (Joule) - 3What causes an electrical current to pass between two points?Electromagnetic Field or Voltage
- 4According to Ohm’s Law, what does Resistance measure?Resistance: measure of difficulty electrons have in flowing through a particular object (Ohm's)
- 5Is resistance the same as impedance?Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent.
- 6Describe each of the following: Current, Voltage, ResistanceCurrent: the rate at which charge is flowing
Voltage: the difference in charge between 2 points
Resistance: a material's tendency to resist the flow of charge(current) - 7What is the relationship between Work and Voltage?Voltage *between 2 points is equal to the work done per unit of charge against a static electric field to move the charge between 2 points*
- 8What is the purpose and usage of a Transformer? What is it’s role in the transmission of Power?Transformer's are used to split currents into multiple circuits. Used to increase or decrease the alternating voltages in electric power applications.
- 9What are the drawbacks of an AC Power Grid?Cannot be stored and must be produced on-demand
- 10What is the standard frequency and phase of power used in North America60Hz
Three Phase Power (AC): Generation, Transmission, Distribution - 11What is the difference between Neutral and Ground in an electrical system?Ground or earth is the reference point in an electrical circuit from which voltages are measured, a direct physical connection to the Earth. (Doesn't carry Current)
Neutral point of an electrical supply system is often connected to ground. (Carries Current) - 12What are the three stages used the describe the Power Grid?Generation, transmission, Distribution
- 13What is three-phase Power? What are the advantages?Type of polyphase system. 3 conductors each carry an alternating current in an electrical grids.
More efficient use of conductors - 14Describe the difference between a brushed and brushless motor.To be continued...
- 15What does Enthalpy measure?a measure of the total energy of moist air including its internal energy and its volume and pressure
- 16What is a BTU?British Thermal Units: A BTU is the amount of heat required to raise the temperature of 1 pound of liquid water by 1 degree F at a constant pressure of 1 atmospheric
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- 300 Arch FlashCards sobre EXAM 2, criado por Justine Bradley em 12-04-2017.
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- Criado por Justine Bradley · 12 abr 2017
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