Homework for tomorrow Ch 23 CQ 3 Probs 3 8 amp 10 CQ5 λ lt a 2216 20 mm 2218 024 mm Office hours MW 1230130 pm TR 910 am ID: 187362
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Slide1
Announcements
Homework for tomorrow…
(Ch. 23,
Hmwk
Set 23.2)
1) a)
4.1 A
b)
3.9
Ω
2)
a) 1.3 x 10
-3
C b) 650 W c) 0.78 J
3)
1.5
Ω∙m
Office hours…
MW 2-3 pm
TF 11-12 pm
R 9-10 am
Tutorial Learning Center (TLC) hours:
M 8-5 R 8-1, 2-8
T 11-8 F 9-11, 1-3
W 8-7 SU 1-6
Slide2
Chapter 23
Circuits
(
Series and Parallel Circuits
)Slide3
Kirchoff’s
Junction Law
…
Kirchoff’s
Loop Law
…
Last time…Slide4
How does the brightness of bulb
B
compare to that of bulb
A
?
Bulb
B is brighter.Bulb A is brighter.Both bulbs have the same brightness.
Quiz Question 1Slide5
Consider two resistors in
series…
Can we find an
equivalent resistor,
R
eq
, to the two resistors, R1 & R2?
23.3:Series and Parallel Circuits
+
-
R
1
R
2
+
-
R
eqSlide6
Consider two resistors in
series…
Can we find an
equivalent resistor,
R
eq
, to the two resistors, R1 & R2?
YES!
23.3:
Series and Parallel Circuits
+
-
R
1
R
2
+
-
R
eqSlide7
Consider several resistors in
series…
Can we find an
equivalent resistor,
R
eq
, to the resistors, R1, R2, … (all in series)?
23.3:
Series and Parallel Circuits
+
-
R
1
R
2
+
-
R
eq
R
3Slide8
Consider several resistors in
series…
Can we find an
equivalent resistor,
R
eq
, to the resistors, R1, R2, … (all in series)?
YES!
23.3:
Series and Parallel Circuits
+
-
R
1
R
2
+
-
R
eq
R
3Slide9
What is the current in the circuit below?
Draw a graph of potential versus position in the circuit, going CW from
V
= 0V
at the battery’s negative terminal.
i.e.:
A series resistor circuitSlide10
Consider two resistors in
parallel
…
Can we find an
equivalent resistor
,
Req, to the two resistors, R1 & R2?23.3:Series and Parallel Circuits
R
1
R
2
+
-
+
-
R
eqSlide11
Consider two resistors in
parallel
…
Can we find an
equivalent resistor
,
Req, to the two resistors, R1 & R2?
YES!
23.3:
Series and Parallel Circuits
R
eq
+
-
R
1
R
2
+
-Slide12
Consider several resistors in
parallel
…
Can we find an
equivalent resistor
,
Req, to the resistors, R1, R2, … (all in parallel)?
23.3:
Series and Parallel Circuits
+
-
R
1
R
2
+
-
R
3
R
eqSlide13
Consider several resistors in
parallel
…
Can we find an
equivalent resistor
,
Req, to the resistors, R1, R2, … (all in parallel)?
YES!
23.3:
Series and Parallel Circuits
+
-
R
1
R
2
+
-
R
3
R
eqSlide14
The three resistors of the figure below are connected to a
9V
battery.
Find the
battery
current and the current through each resistor. i.e.:A parallel resistor circuitSlide15
The battery current
I
is
3 A
2 A
1 A
2/3 A 1/2 A
Quiz Question 2Slide16
When the switch closes, the battery current
increases.
stays the same.
decreases.
Quiz Question 3Slide17
When the switch closes, the battery current
increases.
stays the same.
decreases.
Notice:
The equivalent of several resistors in parallel is
always less than any single resistor in the group.
Quiz Question 3Slide18
What is the
equivalent resistance
of the group of resistors shown in the figure below?
i.e.:
A combination of resistors
10
Ω
90
Ω
45
Ω
25
ΩSlide19
Consider the circuit below, where the switch is open. The current is the same through bulbs
A
and
B
, and they are equally bright. Bulb
C
is not glowing.The switch is now closed, what happens to the brightness of A?It increases.It decreases.It stays the same.
Quiz Question 4Slide20
Find the current through and the potential difference across the
100
Ω
resistor in the circuit below.
i.e.
Analyzing a two-loop circuit
300
Ω
100
Ω
200
Ω
19V
12V