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# lecture16 - Physics for Scientists Engineers 2 Chapter 25 1...

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September 29, 2011 Physics for Scientists & Engineers 2, Chapter 25 1

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September 29, 2011 Physics for Scientists&Engineers 2 2 +13.7 V 0V In parallel: Observation: Take out one bulb, nothing happens to the others Assume: The bulbs are almost identical and have the same resistance
September 29, 2011 Physics for Scientists&Engineers 2 3 +13.7 V 0V In parallel: What voltage drop will be measured across one light bulb? A) 4.57 V B) 13.7 V C) 41.1 V

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September 29, 2011 Physics for Scientists&Engineers 2 4 +13.7 V 0V In parallel: What voltage drop will be measured across one light bulb? B) 13.7 V Since the bulbs are wired in parallel: the voltage drop is the same for all and equal to the voltage supplied by the emf device
September 29, 2011 Physics for Scientists&Engineers 2 5 +13.7 V 0V In series: Observation: Taking one bulb out breaks the circuit. The more bulbs we put in series, the dimmer they get! Assume: the bulbs are almost identical and have the same resistance

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September 29, 2011 Physics for Scientists&Engineers 2 6 +13.7 V 0V In series: What voltage drop will be measured across one light bulb? A) 4.57 V B) 13.7 V C) 41.1 V
September 29, 2011 Physics for Scientists&Engineers 2 7 +13.7 V 0V In series: What voltage drop will be measured across one light bulb? A) 4.57 V In series: V emf =V 1 +V 2 +V 3 , all resistances are the same. We measure V emf /3=13.7/3=4.57 V across each bulb

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Which of the arrangements of three identical light bulbs shown in the gure draws most current from the battery? A. 1 B. 2 C. 3 D. All three draw equal current. E. 1 and 3 are tied for drawing the most current. September 29, 2011 Physics for Scientists & Engineers 2, Chapter 25 8 1 2 3 Δ V = iR eq i = Δ V R eq 1: 1 R eq = 1 R + 1 R + 1 R = 3 R R eq = R 3 2: 1 R eq = 1 R + 1 2 R = 3 2 R R eq = 2 R 3 3: R eq = 3 R
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lecture16 - Physics for Scientists Engineers 2 Chapter 25 1...

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