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Unformatted text preview: Sconces 4— Ohms Lew I 1. Calculate the power dissipated or generated by each source in the following circuits. 2. State if the following connections of sources is valid or not. Explain why or why not. 5V _
1A 2A
2v 9 3. State if the following connections of sources are valid or not. Explain why or why not. 1A
2V 9 9 8V
8A
1 4. State if the following connections of sources is valid or not. Explain why or why not. 2A 5V 9 5V 2A 5. Compute the power dissipated by these two devices that you will soon learn about. Note that the
BJT transistor has two components to its power dissipation. l 200 mA
2A .2V H
__ .__[>}__.
+ .7V _ Silicon Diode B] T Transistor 6. A typical house wiring circuit can safely pass 15 amps before the circuit breaker trips. How many
100W bulbs can be illuminated on such a circuit? (Assam, wining C\fL(ui‘l' \IoHAge is \20 v. 7. A linear voltage regulator is used to create a 3.3V supply voltage from a 9V input. When the load
consumes 100mA, how much power does the regulator dissipate assuming the current ﬂowing
into ground from the regulator is zero? How efficient is this system as measured by: regulator efficiency 2 [(load power delivers to load) / (total power supplied by 9V source)] *100 0N
Regulator 8. Circle the correct answer below to indicate if the potato is generating or dissipating power. 2 A —2A
> <___
+ +
5 V 5 V
Generating Generating Dissipating Dissipating 9. Circle the correct answer below to indicate if the potato is generating or dissipating power. 2A —2A
H .6
5 V 5 V
+ +
Generating Generating
Dissipating Dissipating 10. State if the following vegetables and fruits are generating or dissipating power. ,/ '"/ \ .’ 11. Circle the correct answer below each circuit element to indicate if the element is generating or
dissipating'power. + + — _
 2A —5V 5 V 2 A 5V 2A _5V 2 A ~ — + . + Generating Generating Generating Generating Dissipating Dissipatng Dissipating Dissipatng 12. What is a potentiometer? 13. Fillinthe blanks:
a) To disturb a circuit under test the least, an ammeter should have internal resistance. b) To disturb a circuit under test the least a voltmeter should have internal
resistance. 14. Draw a VI curve of: a. A voltage source b. A current source c. A resistor 15. In the circuit below, R1 is connected to another circuit element, and has voltage and current as
shown: ' I=1mA
% R1 v=5v a. From the information given, circuit element X is:
1. A voltage source
2. A current source 3. Can't tell b. The size of resistor R1 is c. The power dissipated in R1 is 16. Match each of the following with the correct currentvoltage (IV) plot, by writing the appropriate
letter in the space by each plot. Ideal voltage source (10V)
Ideal current source (ZmA).
Open circuit Short circuit 2K Ohm resistor 500 Ohm resistor rm 995:.» $1110 (and) I(mA)
2
1
._
l I —i I I —i
—2 —1 1 2 VV
_ V(V) ( )
1 2.
V(V) I (mA) ~10 —5 5 15
V (V) 17. Use Ohm's Law to ﬁnd 11: 11
————a MORE, 500% + Ohms LAW Dnobhms 21. The starter motor in a 12V automobile ignition system has an internal resistance of 0.05 ohms.
a) When a full 12 volts is applied to the starter motor, how much current does
it draw?
b) If the battery cables going to and from the starter motor have a combined
resistance of 0.01 ohms, how much current is drawn by the starter motor?
c) Under the conditions of (b), how much voltage appears across the starter motor?
d) What amount of resistance in the battery cables would drop the voltage across the starter motor to 6 volts?
22. How much internal resistance does a 120W, 125 volt light bulb have? 23. For the schematic diagram below, calculate the following values:
a) the current I, flowing in the circuit
b) the power dissipated by R1, R2, and R3
c) the power dissipated by V1 50  25 10
2 R1 R2 R3
V1
12V
I
V'
Fig. l 24. On a VI axis like one shown below, draw:
a) 5v independent voltage source
b) —2A independent current source
c) 2 ohm resistor '
d) ~4v independent voltage source
e) 1A independent current source Fig. 2 25. A robot's 3V battery pack has a capacity of 2850mAh. When the robot moves
forward, its motor appears as a resistive load of 12 ohms. The forward speed of
the robot is 0.5ft/sec. How many inches will the robot travel before it stops?
Assume the motor will run until the last coulomb of charge has been consumed. 26. According to a\somewhat dubious product advertisement, a particular walkie—
talkie has a transmit power of 500W. When used with a 9.6 volt battery, which has
a capacity of 900mAh, how long would you be able to talk? Assume the battery can
maintain its voltage rating until the last Coulomb of charge has been delivered.
Express you answer in seconds. ’ 275. For the circuit below, find I, Vw, and the power dissipated in each element.
The voltage V“ is measured between nodes A and B with node "B" being the reference
or negative terminal. Fig. 3 25 D. A schematic diagram is shown below with a voltage source and three unknown
circuit elements El, E2, E3 and E4. Circle the correct answer for the questions below. Fig. 4 a) The voltage across E3 the voltage across E4.
1) is the same as
2) is different from
3) is unrelated to
b) The current through E3 the current through E4.
1) is the same as
2) is different from
3) may be unrelated to
c) The current through E2 is equal to the current through E3 plus the current
through E4.
1) true
2) false
3) can't tell
d) The voltage across V1 is equal to the sum of the voltages across E2 and E3 or
E4.
1) true 2) false
3) can't tell un. For the circuit below, determine the power dissipation for each numbered
element. Fig. 5 ZC>ﬂ. Using only Ohms law and what you know about how resistors and voltage sources
add in series, find the following: Vr3, Ix and power dissipated by V2. Fig. 6 3'19. Determine the quantity of power dissipation or generation for each potato.
State dissipation, generation, and the scalar quantity. ...
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 Winter '09
 TRAYLOR
 Volt, Resistor, voltage regulator, Electrical resistance, Voltage source

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