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Ch 34 & 35 Review

Ch 34 & 35 Review. Current and circuits. Units and Symbols. Resistance Current Voltage Power Battery. Types of current in the US. DC Direct current – from a battery, solar panel AC

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Ch 34 & 35 Review

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  1. Ch 34 & 35 Review Current and circuits

  2. Units and Symbols Resistance Current Voltage Power Battery

  3. Types of current in the US DC Direct current – from a battery, solar panel AC Alternating current – electric current repeatedly reverses direction because the voltage polarity continually switches back and forth In the US, it has a frequency of 60 Hz, in many other parts of the world the frequency is 50 Hz

  4. Ac to DC

  5. definitions Short circuit a faulty or accidental connection between two points of different potential in an electric circuit, bypassing the load and establishing a path of low resistance through which an excessive current can flow. It can cause damage to the components if the circuit is not protected by a fuse

  6. Closed/open circuit A closed circuit allows current to flow through the path of wires, an open circuit has a break in the path so no current flows

  7. relationships What factors affect the resistance of a wire?

  8. What is Ohm’s law The power equation How can Ohm’s law be incorporated into the power equation?

  9. Electrical resistance in Series RT = R1 + R2 + R3 Parallel

  10. Thick and Thin filament problems Will a lamp with a thick filament draw more current or less current than a lamp with a thin filament? One lamp is 60 W and the other is 75W, which has the thicker filament? Which draws the most current? If connected in series, which has the most current? Greatest voltage drop? If connected in parallel, which draws the most current? Greatest voltage drop?

  11. Thick and Thin filament problems Will a lamp with a thick filament draw more current or less current than a lamp with a thin filament? Assume same voltage source, 10 V, the larger the area of the wire, the more current it will allow. One lamp is 60 W and the other is 75W, which has the thicker filament? Draws the most current? Assume 10 V across each lamp, P=VI, so I=P/V, larger the wattage, the greater the current, greater current means thicker wire

  12. If connected in series, which has the most current? Greatest voltage drop? In series, same current through all resistors With same current, Greater the resistance = greater the voltage drop If connected in parallel, which draws the most current? Greatest voltage drop? Voltage same across each branch in parallel, Higher the resistance of a branch, the lower the current

  13. How voltage changes? How current changes?

  14. Series and parallel circuits • video

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