2018+Electrical+Systems

=2018 Electrical Circuits=

Tuesday



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Wednesday



More notes from Tuesday's poesrpoint (circuit diagrams and current, resistance, voltage drops)



Thursday

Notes on resistance and Ohm's Law (from previous ppt)



Tuesday





Wednesday



Monday



Wednesday

AC vs DC notes from ppt

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PRACTICE TEST CONCEPTUAL QUESTIONS


 * 1) How do batteries create a current? What causes current to flow? How is the current related to electron drift?
 * 2) What is voltage and/or voltage drop?
 * 3) Where do you measure current and voltage on a circuit (in general)? Why?
 * 4) When measuring current or voltage with the multimeter, why do you get a negative sign if you mix up the red and black leads?
 * 5) If electron drift is so slow (0.01 cm/s) why do devices turn on the instant you close the switch? If given the length of a circuit, could you calculate how long it takes for an electron starting at the - terminal to reach the + terminal?
 * 6) What is resistance and why does it cause heat? (think about resistance and electrical "friction"?)
 * 7) Why do short circuits cause an increase in current? Why could that be dangerous?
 * 8) Why are wire that are gauged for high current always bundles of smaller wires instead of just one thicker wire?
 * 9) How do fuse boxes and circuit breakers work? Why is one not used anymore?
 * 10) What is the difference between series and parallel circuits? How are current, resistance, and voltage drops affected when you add bulbs in each type?
 * 11) What are capacitors and how do they work? Why do they only provide current for a short amount of time? What three factors affect the quality of a capacitor?
 * 12) What is power and how do you calculate it?
 * 13) What is energy and how do you calculate it?
 * 14) On our electrical bills, are we paying for power or energy? How does the electrical company determine how much you owe?
 * 15) What is an RIV table, and how do you calculate them for series, parallel, and combination circuits?
 * 16) What is the difference between DC and AC current?

PRACTICE TEST CALCULATION PROBLEMS


 * 1) Royal Electric Company charges $0.0975 per kilowatt-hour. Your hair krimper draws 120 volts at 1.5 amps and you use it for 30 minutes. How much does krimping your hair cost you?
 * 2) Energy efficient light bulbs are typically 12 W. Assuming your electric company charges $0.0975 per kilowatt hour and you use the bulb for approximately 4 hours a day, how much money do you save over a year? Assume a typical bulb is 60 W