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Light bulb When switch is closed, bulbs are … Brighter The same Dimmer than the bulb above (?)

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Presentation on theme: "Light bulb When switch is closed, bulbs are … Brighter The same Dimmer than the bulb above (?)"— Presentation transcript:

1 Light bulb When switch is closed, bulbs are … Brighter The same Dimmer than the bulb above (?)

2 When switch is closed, the right bulb will be … Brighter The same Dimmer than the left bulb now (?)

3 EXAMPLE: What’s the voltage across, and the current thru each resistor? 12V 100  200  (compare with equivalent R method …)

4 EXAMPLE: What’s the voltage across, and the current thru each resistor?

5 Electric circuits: Kirchhoff’s Rules start

6 Electric circuits: Kirchhoff’s Rules start

7 Electric circuits: Kirchhoff’s Rules start

8 Electric circuits: Kirchhoff’s Rules start

9 Electric circuits: Kirchhoff’s Rules start

10 The height analogy

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17 (weeeee!)

18 The height analogy

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28 Electric circuits: Kirchhoff’s Rules Rule 1: The sum of voltage drops around a loop is always zero! (Energy conserved)

29 The voltage divider 1/2 (solve for I ) No numbers yet!

30 The voltage divider 2/2 (solve for V 1 & V 2 ) No numbers yet!

31 The voltage divider: Numbers!

32 Electric circuits: Kirchhoff’s Rules Rule 2: The sum of currents entering a junction must equal the sum of currents leaving it! (comes in = goes out)

33 Parallel Circuit No numbers yet!

34 Parallel Circuit Numbers

35 A not-to-bad example: NY Kirchhoff’s laws step-by-step …

36 A not-to-bad example: Currents! 1)Guess directions

37 A not-to-bad example: Currents! 1)Guess directions 2)Use nodes to reduce set

38 A not-to-bad example: Voltage Loops! Loop ab cd + - -

39 A not-to-bad example: Voltage Loops! + + ab c d Loop 2

40 Solve the equations for the currents! No problem here

41 A not-to-bad example: The Check!

42 A bad example: + +

43 I ) Assign currents! + +

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46 II ) Look at currents in & out of nodes + +

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48 III ) Assign voltage differences (drops)

49 IV ) Loops! Voltage differences must add to zero a bc d

50 a bc d

51 V ) Now, solve those currents More space

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54 Now …

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