Version 001 – HW10 – gavrin – (25111)
1
This print-out should have 13 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
8.2 V
Heater and Fan
001 (part 1 of 4) 10.0 points
A lamp (144 Ω), an electric heater (20.5 Ω),
and a fan (40.2 Ω) are connected in parallel
across a 112 V line.
What total current is supplied to the circuit?
I
Correct answer: 9.02726 A.
17.2 Ω
I
19.3 Ω
18.2 V
I
Find the current through the 17.2 Ω resistor
and the 8.2 V battery at the top of the circuit.
Correct answer: 1.53488 A.
002 (part 2 of 4) 10.0 points
What is the voltage across the fan?
Correct answer: 112 V.
007 (part 2 of 3) 10.0 points
Find the current through the 19.3 Ω resistor
in the center of the circuit.
003 (part 3 of 4) 10.0 points
What is the current in the lamp?
Correct answer: −0.943005 A.
Correct answer: 0.777778 A.
008 (part 3 of 3) 10.0 points
Find the current through the 18.2 V battery
at the bottom of the circuit.
Correct answer:
Ω.
Currents in a Circuit 03
006 (part 1 of 3) 10.0 points
In this problem assume
1 the batteries have zero internal resistance,
2 the currents are flowing in the direction
indicated by the arrows. A negative current
denotes flow opposite to the direction of the
arrow.
14.3 Ω
Ω
.6
Triple the Current
005 10.0 points
The current in a circuit is tripled by connecting a 544 Ω resistor parallel with the resistance of the circuit.
Determine the resistance of the circuit in
the absence of the 544 Ω resistor.
Resistance Circuit 04
009 10.0 points
Consider the circuit
a
14.3 Ω
28
Correct answer: 611.902 W.
Correct answer: 2.47789 A.
28.6 Ω
004 (part 4 of 4) 10.0 points
What is the power expended in the heater?
28.6 Ω
b
What is the equivalent resistance between
the points a and b ?
Correct answer:
Ω.
Serway CP 18 20
010 (part 1 of 2) 10.0 points
In the circuit of the figure, the current I1 is
1.9 A and the value of E2 is unknown.
Version 001 – HW10 – gavrin – (25111)
17 V
9.3 Ω
1.9 A
4.1 Ω
a
b
I2
E2
5.9 Ω
I3
What is the magnitude of the current I2 ?
Correct answer:
A.
011 (part 2 of 2) 10.0 points
Find I3 .
Correct answer:
A.
Internal Resistance 02
012 (part 1 of 2) 10.0 points
A battery with an emf of 16.3 V and internal
resistance of 0.94 Ω is connected across a load
resistor R.
If the current in the circuit is 1.67 A, what
is the value of R?
Correct answer: 8.82048 Ω.
013 (part 2 of 2) 10.0 points
What power is dissipated in the internal resistance of the battery?
Correct answer: 2.62157 W.
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