Download presentation

Presentation is loading. Please wait.

Published byJoseph Mathews Modified about 1 year ago

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

17
(weeeee!)

18
The height analogy

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: 19.27 + + NY Kirchhoff’s laws step-by-step …

36
A not-to-bad example: 19.27 + + Currents! 1)Guess directions

37
A not-to-bad example: 19.27 + + Currents! 1)Guess directions 2)Use nodes to reduce set

38
A not-to-bad example: 19.27 Voltage Loops! Loop 1 + + ab cd + - -

39
A not-to-bad example: 19.27 Voltage Loops! + + ab c d + - - - Loop 2

40
Solve the equations for the currents! No problem here

41
A not-to-bad example: 19.27 The Check! + + + + - - - -

42
A bad example: + +

43
I ) Assign currents! + +

44
+ +

45
+ +

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

47
+ +

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

54
Now …

55
+ - + + + - - + -

56
+ - + + + - - + -

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google