A 10 V emf battery is connected in series with the following: a 2 microfarad capacitor, a 2 ohm resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor. After the switch has been closed for a - PowerPoint PPT Presentation

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A 10 V emf battery is connected in series with the following: a 2 microfarad capacitor, a 2 ohm resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor. After the switch has been closed for a

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Title: A 10 V emf battery is connected in series with the following: a 2 microfarad capacitor, a 2 ohm resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor. After the switch has been closed for a


1
A 10 V emf battery is connected in series with
the following a 2 microfarad capacitor, a 2 ohm
resistor, an ammeter, and a switch, initially
open a voltmeter is connected in parallel across
the capacitor. After the switch has been closed
for a relatively long period (several seconds,
say), what are the current and capacitor voltage
readings, respectively?
  1. zero A, 10 V
  2. zero A, zero V
  3. 5 A, zero V
  4. 5 A, 10 V

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2
The following three appliances are connected to a
120 volt house circuit i) toaster, 1200 W, ii)
coffee pot, 750 W, and iii) microwave, 600 W. If
all were operated at the same time what total
current would they draw?
  1. 3 A
  2. 5 A
  3. 10 A
  4. 21 A

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3
A 10 V emf battery is connected in series with
the following a 2 microfarad capacitor, a 2 ohm
resistor, an ammeter, and a switch, initially
open a voltmeter is connected in parallel across
the capacitor. At the instant the switch is
closed, what are the current and capacitor
voltage readings, respectively?
  1. zero A, 10 V
  2. zero A, zero V
  3. 5 A, zero V
  4. 5 A, 10 V

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4
A battery with an emf of 6.3 V is connected in
series with a resistor of 2.0 ohms. What is the
total power delivered by the battery to the
circuit?
  1. 22.0 W
  2. 20.0 W
  3. 12.6 W
  4. 25.2 W

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5
A battery with an emf of 6.3 V is connected
across the ends of an external resistor of 2
ohms. What is the current through the resistor?
  1. 12.6 A
  2. 6.3 A
  3. 3.15 A
  4. 5.3 A

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6
Three resistors having values of 4.0, 6.0 and 8.0
ohms, are connected in series. What is their
equivalent resistance?
  1. 18.0 ohms
  2. 8.0 ohms
  3. 6.0 ohms
  4. 1.8 ohms

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7
Three resistors having values of 4.0, 6.0 and
10.0 ohms, are connected in parallel. What is
their equivalent resistance?
  1. 20.0 ohms
  2. 7.3 ohms
  3. 6.0 ohms
  4. 1.9 ohms

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8
Three resistors connected in parallel have
individual values of 4.0, 6.0 and 10.0 ohms,
respectively. If this circuit is connected to a
12.0 V battery what is the current in the 10 ohm
resistor?
  1. 0.55 A
  2. 5.2 A
  3. 1.2 A
  4. 2.0 A

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9
Three resistors connected in parallel have
individual values of 4.0, 6.0 and 10.0 ohms,
respectively. If this combination is connected in
series with a 12.0 V battery and a 2.0 ohm
resistor, what is the current in the 10 ohm
resistor?
  1. 0.59 A
  2. 1.0 A
  3. 11.2 A
  4. 16.0 A

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10
Consider the circuit shown in the figure. What
power is dissipated by the entire circuit?
  1. 14 W
  2. 28 W
  3. 56 W
  4. 112 W

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11
If I 2.0 mA and the potential difference, VA -
VB 30 V in the circuit segment shown, determine
the charge and polarity of the capacitor.
  1. 1.5 mC, left plate is positive
  2. 1.5 mC, right plate is positive
  3. 0.50 mC, left plate is positive
  4. 0.50 mC, right plate is positive

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12
A series RC circuit has a time constant of 1.0 s.
The battery has a voltage of 50 V and the
maximum current just after closing the switch is
500 mA. The capacitor is initially uncharged.
What is the charge on the capacitor 2.0 s after
the switch is closed?
  1. 0.43 C
  2. 0.66 C
  3. 0.86 C
  4. 0.99 C

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13
A voltage source of 10 V is connected to a series
2 C circuit where R 2 x 106 W and C 3 µ F.
Find the time required for the current in the
circuit to decay to 5 of its original value.
  1. 3 s
  2. 6 s
  3. 9 s
  4. 18 s

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14
In the circuit segment shown, I 20 mA and Q
50 µ C. What is the potential difference, VA -
VB ?
  1. -40 V
  2. 40 V
  3. 20 V
  4. -20 V

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15
If E 20 V, at what rate is thermal energy being
generated in the 20 W resistor?
  1. 6.5 W
  2. 1.6 W
  3. 15 W
  4. 26 W

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16
If E 24 V, at what rate is thermal energy
generated in the 5 W resistor?
  1. 13 W
  2. 3.2 W
  3. 23 W
  4. 39 W

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17
If E 9.0 V, what is the current in the 15-W
resistor?
  1. 0.20 A
  2. 0.30 A
  3. 0.10 A
  4. 0.26 A

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18
In a circuit, a current of 1.0 A is drawn from a
battery. The current then divides and passes
through two resistors in parallel. One of the
resistors has a value of 64 W and the current
through it is 0.2 A. What is the value of the
other resistor?
  1. 8 W
  2. 16 W
  3. 24 W
  4. 32 W

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19
Four 1.5 volt AA batteries in series are used to
power a transistor radio. If the batteries hold a
total charge of 240 C, how long will they last if
the radio has a resistance of 200 W?
  1. 1.1 hours
  2. 2.2 hours
  3. 4.1 hours
  4. 13 hours

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20
What is the maximum number of 100 Watt lightbulbs
you can connect in parallel in a 120 V home
circuit without tripping the 20 A circuit breaker?
  1. 11
  2. 17
  3. 23
  4. 29

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21
An electric heater draws 1300 W, a toaster draws
1000 W, and an electric oven draws 1540 W. If all
three of these appliances are operating in
parallel on a 120 V circuit, what is the total
current draw?
  1. 23.4 A
  2. 31.7 A
  3. 39.9 A
  4. 47.7 A

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22
How much power is being given off by one of the
10 ohm resistors?
  1. 24.0 W
  2. 9.6 W
  3. 16.0 W
  4. 6.4 W

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23
What is the current flowing through the 2 ohm
resistor?
  1. 2 A
  2. 3 A
  3. 4 A
  4. 6 A

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24
What is the current flowing through the 8 ohm
resistor?
  1. 1 A
  2. 2 A
  3. 3 A
  4. 6 A

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25
What is the equivalent resistance for these
resistors?
  1. 2.3 ohms
  2. 5.2 ohms
  3. 13 ohms
  4. 22 ohms

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26
What is the equivalent resistance for these
resistors?
  1. 1.33 ohms
  2. 2.25 ohms
  3. 3.0 ohms
  4. 7.5 ohms

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27
What is the potential difference between point a
and b ?
  1. 6 V
  2. 8 V
  3. 12 V
  4. 24 V

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28
How much current is flowing in one of the 10 ohm
resistors?
  1. 0.8 A
  2. 2.0 A
  3. 1.6 A
  4. 2.4 A

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29
Consider the wheatstone bridge circuit. R3 4W
and the ratio R2 /R4 3 and the galvanometer
reads zero current. If the current in R3 0.50
A, what is the current in R1 ?
  1. 0.17 A
  2. 0.50 A
  3. 1.5 A
  4. 0.75 A

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30
What is the current through the 4 ohm resistor?
  1. 1.0 A
  2. 0.5 A
  3. 1.5 A
  4. 2.0 A

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31
What is the current through the 8 ohm resistor?
  1. 1.0 A
  2. 0.5 A
  3. 1.5 A
  4. 2.0 A

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32
Consider the wheatstone bridge circuit. R3 4W
and the ratio R2 /R4 3 and the galvanometer
reads zero current. If the current in R3 is 0.50
A, what is the current in R4 ?
  1. 0.17 A
  2. 0.50 A
  3. 1.5 A
  4. 0.75 A

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33
Consider the wheatstone bridge circuit. R3 4W
and the ratio R2 /R4 3. The galvanometer reads
zero current. What is R1 ?
  1. 0.75 ohms
  2. 1.33 ohms
  3. 12 ohms
  4. 15 ohms

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34
Consider the wheatstone bridge circuit. R3 4W
and the ratio R2 /R4 3 and the galvanometer
reads zero current. The potential difference
across R4 is 3 V. What is the potential
difference across R2 ?
  1. 1 V
  2. 2 V
  3. 3 V
  4. 9 V

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35
If a certain capacitor is charged to 10 V and
then, at t 0, allowed to discharge through a
certain resistor. There will be a certain time
before the voltage across the capacitor reaches 5
V. This time can be decreased for this circuit by
increasing
  1. the size of the capacitor.
  2. the size of the resistor.
  3. the size of the time constant.
  4. none of the choices.

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36
Three resistors, each with resistance R1, are in
parallel in a circuit. They are replaced by one
equivalent resistor, R. Comparing this resistor
to the first resistor of the previous circuit,
  1. the current through R equals the current through
    R1
  2. the voltage across R equals the voltage across R1
  3. the power given off by R equals the power given
    off by R1
  4. R is bigger than R1

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37
What is Kirchhoff's 1st equation for this
junction?
  1. I1 l2 l3
  2. I2 I1 l2
  3. I3 I1 l2
  4. I1 I2 l3 0

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38
Three resistors, each with resistance R1 , are in
series in a circuit. They are replaced by one
equivalent resistor, R. Comparing this resistor
to the first resistor of the previous circuit,
  1. the current through R equals the current through
    R1
  2. the voltage across R equals the voltage across R1
  3. the power given off by R equals the power given
    off by R1
  4. R is smaller than R1

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39
Which voltage is not caused by a source of emf?
  1. the voltage across a charged capacitor
  2. the voltage across two copper-iron junctions at
    different temperatures
  3. the voltage across the terminals of a dry cell
    battery
  4. the voltage from an electric generator

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40
Which resistor is in series with resistor R?
  1. R1
  2. R2
  3. R3
  4. R4

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41
Which two resistors are in parallel with each
other?
  1. R and R4
  2. R2 and R3
  3. R2 and R4
  4. R and R1

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42
A 1000 V battery, a 3000 ohm resistor and a 0.5
microfarad capacitor are connected in series with
a switch. The time constant for such a circuit,
designated by the Greek letter, tau, is defined
as the time that the capacitor takes to charge to
63 of its capacity after the switch is closed.
What is the current in the circuit at a time
interval of tau seconds after the switch has been
closed?
  1. 0.14 A
  2. 0.21 A
  3. 0.12 A
  4. 0.32 A

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43
A 1000 V battery, a 3000 ohm resistor and a 0.5
microfarad capacitor are connected in series with
a switch. The capacitor is initially uncharged.
What is the value of the current the moment after
the switch is closed?
  1. 0.39 A
  2. 0.33 A
  3. 0.84 A
  4. 2000 A

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44
A 1000 V battery, a 3000 ohm resistor and a 0.5
microfarad capacitor are connected in series with
a switch. The time constant for such a circuit,
designated by the Greek letter, tau, is defined
as the time required to charge the capacitor to
63 of its capacity after the switch is closed.
What is the value of tau for this circuit?
  1. 6.0 x 109 s
  2. 1.67 x 10-10 s
  3. 1.67 x 10-7 s
  4. 1.5 x 10-3 s

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45
Two resistors of values 6 and 12 ohms are
connected in parallel. This combination in turn
is hooked in series with a 3 ohm resistor and a
24 V battery. What is the current in the 6 ohm
resistor?
  1. 2.0 A
  2. 3.0 A
  3. 6.0 A
  4. 12.0 A

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46
Which of the following devices is designed to
measure an approximate value for the resistance
of a conductor?
  1. ammeter/voltmeter combination
  2. voltmeter
  3. thermocouple
  4. ammeter

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47
Three resistors, with values of 3, 6 and 12 ohms,
respectively, are connected in series. What is
the overall resistance of this combination?
  1. 0.58 ohms
  2. 1.7 ohms
  3. 7.0 ohms
  4. 21.0 ohms

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48
Three resistors, with values of 3, 6 and 12 ohms,
respectively, are connected in parallel. What is
the overall resistance of this combination?
  1. 0.58 ohms
  2. 1.7 ohms
  3. 7.0 ohms
  4. 21.0 ohms

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49
Which of the following devices is designed to
measure the resistance of a conductor more
accurately?
  1. ammeter/voltmeter combination
  2. voltmeter
  3. Wheatstone bridge
  4. ammeter

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50
Two resistors of values 6 and 12 ohms are
connected in parallel. This combination in turn
is hooked in series with a 4 ohm resistor. What
is the overall resistance of this combination?
  1. 0.5 ohms
  2. 2.0 ohms
  3. 8.0 ohms
  4. 22.0 ohms

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51
Two resistors of values 6 and 12 ohms are
connected in parallel. This combination in turn
is hooked in series with a 2 ohm resistor and a
24 V battery. What is the current in the 2 ohm
resistor?
  1. 2.0 A
  2. 4.0 A
  3. 6.0 A
  4. 12.0 A

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52
Three resistors with values R1 , R2 and R3 ,
respectively, are connected in parallel. Which of
the following expresses the total resistance, R t
, of the three resistors when connected in
parallel?
  1. Rt R1 R2 R3
  2. Rt (1/R1 1/R2 1/R3)
  3. Rt R1 R2 R3
  4. Rt (1/R1 1/R2 1/R3 )-1

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53
Three resistors with values of R1 , R2 and R3 ,
respectively, are connected in series. Which of
the following expresses the total resistance, R t
, of the three resistors?
  1. Rt R1 R2 R3
  2. Rt (1/R1 1/R2 1/R3)
  3. Rt R1 R2 R3
  4. Rt (1/R1 1/R2 1/R3 )-1

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54
Three resistors connected in parallel have the
individual voltages labeled V1 , V2 and V3 ,
respectively. Which of the following expresses
the total voltage across the three resistors when
connected in this manner?
  1. Vt V1 V2 V3
  2. Vt (1/V1 1/V2 1/V3)
  3. Vt V1 V2 V3
  4. Vt (1/V1 1/V2 1/V3 )-1

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55
Three resistors connected in series have
individual voltages labeled V1 , V2 and V3 ,
respectively. Which of the following expresses
the value of the total voltage taken over the
three resistors together?
  1. Vt V1 V2 V3
  2. Vt (1/V1 1/V2 1/V3)
  3. Vt V1 V2 V3
  4. Vt (1/V1 1/V2 1/V3 )-1

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56
Three resistors connected in series each carry
currents labeled I1 , I2 and I3 . Which of the
following expresses the value of the total
current It in the system made up of the three
resistors in series?
  1. lt l1 l2 l3
  2. lt (1/l1 1/l2 1/l3)
  3. lt l1 l2 l3
  4. lt (1/l1 1/l2 1/3 )-1

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57
Three resistors connected in parallel each carry
currents labeled I1 , I2 and I3 . Which of the
following expresses the value of the total
current It in the combined system?
  1. lt l1 l2 l3
  2. lt (1/l1 1/l2 1/l3)
  3. lt l1 l2 l3
  4. lt (1/l1 1/l2 1/3 )-1

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58
A circuit contains 3 V battery, a 2 ohm resistor,
a 0.3 microfarad capacitor, an ammeter, and a
switch all in series. What will be the current
reading 10 min after the switch is closed?
  1. zero
  2. 0.75 A
  3. 1.5 A
  4. 107 A

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59
A circuit contains a 3 V battery, a 2 ohm
resistor, a 0.3 microfarad capacitor, an ammeter,
and a switch in series. The sum of all the
potential differences taken for all the
components going around the loop is which of the
following?
  1. zero
  2. 3.0 V
  3. -3.0 V
  4. 6.0 V

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60
The basic function of an electromotive force in a
circuit is to do which of the following?
  1. convert electrical energy into some other form
  2. convert some other form of energy into electrical
  3. Both of the choices are valid
  4. None of the choices are valid

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