CHP34_Practice

# CHP34_Practice - the current to move one way, then the...

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Chp. 34 Electric Current 1. T 2. T 3. F 4. F 5. F 6. D 7. D 8. B 9. D 10. D 11. C 12. C 13. A 14. Ohm's Law is needed here: V = I R = (10 A) (10 Ω) = 100 V 15. Power = Voltage (V) * Current (I): So: P= V I , but I = V/R (from Ohm's Law), so: P = V * V/R = V 2 /R = (120) 2 /20 Ω = 720 W (watts) 16. In Direct Current (DC), electrons move one way; the current is always in the same direction. In Alternating Current (AC), the current continually reverses direction causing the electrons carrying
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Unformatted text preview: the current to move one way, then the other. As a result, the electrons in AC are vibrating back and forth. An example of AC, is a light bulb plugged into the outlet; the electrons in the bulb's filament are caused by AC to vibrate back and forth which heats up the filament, making it glow. So the electrons causing the light we see, come from the bulb's filament, not from the wall outlet....
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## This note was uploaded on 10/19/2011 for the course PHY 2020 taught by Professor Staff during the Spring '08 term at University of Florida.

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