lecture16 - September 29, 2011 Physics for Scientists...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: September 29, 2011 Physics for Scientists & Engineers 2, Chapter 25 1 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 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 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 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 V = iR eq i = 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 September 29, 2011...
View Full Document

Page1 / 19

lecture16 - September 29, 2011 Physics for Scientists...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online