DC circuits

# DC circuits - PHY 2049C General Physics B Fields Circuits...

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PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: 1)Battery: Internal Resistance 2)Power 3) Resistors in parallel / series

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Important Points from Last Lecture Current is Charge passing a certain cross-section per time. Ohm's Law: At a certain current: Voltage drop is proportional to “Resistance” R: V= R·I Batt ery +9V 0V +9V 0V R 00 R Δ V= = ⇒ R= Δ V ⇒= 9V Δ V=R I = Q I t Δ = Δ
Question You have just put fresh batteries in your flashlight and it is working nicely. Now suppose that you remove one of the batteries and reinsert it backward. Despite the fact that the one battery is reversed, both batteries connect properly to one another and to the flashlight, so that there are no connection problems in the flashlight. As the result of this battery reversal, the flashlight will A) work in reverse, lighting up when you put its switch in the "off" position and not lighting up when you put its switch in the "on" position. B) remain lit regardless of the position of its on-off switch. C) not light up at all, regardless of the position of its on-off switch. D) work normally, lighting when you switch it "on" and turning off when you switch it "off."

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An ideal battery produces a fixed. ..? A) Current Output B) Electric Potential Energy Output C) Power Output D) Electric Potential Difference E) None of the Above Question

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Where Does the Energy Go?
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## This note was uploaded on 06/29/2010 for the course PHY2049C PHY2049C taught by Professor Duke during the Summer '10 term at FSU.

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DC circuits - PHY 2049C General Physics B Fields Circuits...

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