Download ACADEMIC PHYSICS REVIEW: CIRCUITS

PERIOD:
NAME:
ACADEMIC PHYSICS REVIEW: CIRCUITS
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For each_gEouping, identify which would present more resistance:
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o £ÿng thid(wlrgbshort thick wire
o ÿg, thin wiie;-;ÿhort, thick wire
o Long, cold wire;
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How does the number of charge carriers impact current in a circuit?
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Sketch ohmic, and non-ohmic (be sure include all necessary labels):
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Power is defined as energy used per unit of time. It is the rate of energy consumption. Which of the
following uses the greatest energy (circle yÿswer)?
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5. Determine the equivalent resistance in the parallel circuit:
6. Find equivalent resistance and the net or total current
in the series circuit:
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NAME:
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PERIOD:
Sketch each of the following circuit elements:
a. Open Switch
e. Wire
b.
Closed Switch ÿ
c.
Battery
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d. Lamp Bulb
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Capacitor
Resistor
h.
Plug
8. Observe the graphic of alternating and direct current. What type of power source will produce a
direct current? What have we studied that will produce,
an alternating current?
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Direct Current
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Alternating Current
The diagram below depicts Conventional current flow vs. actual electron flow.
a. Explain why these two seemingly contradictory
representations exist.
Conventional
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Current Flow
Electron Flow
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b. Compare the direction of conventional current
flow to electron flow:
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10. A microwave oven requires 1250 Watts of power to cook food. If the oven is plugged into a 120 V
outlet, what is the resistance in the oven's circuit?
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11. An appliance with a power input of 200 W has a resistance of 860. What is the current in this
appliance?ÿ
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22. Billy hooked up an electrical apparatus that draws 3.4 amps. How many seconds would it take for a
magnitude of 3.928 x 20ÿ9 charges to travel through this apparatus7 (round to the nearest whole
number)
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(Series Circuits)
1. Use the series circuit pictured to the right to answer
questions (a)-(e).
a. What is the total voltage across the bulbs?
b. What is the total resistance of the circuit?
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c, What is the current in the circuit?
d. What is the voltage drop across each light bulb?
(Remember that voltage drop is calculated by
multiplying current in the circuit by the resistance of a
particular resistor: V= IR.)
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e. Draw the path of the current on diagram
2. Use the series circuit pictured to the right to answer
questions (a)-(e).
a. What is the total voltage across the bulbs?
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b. What is the total resistance of the circuit?
c. What is the gurrent in the circuit?
,d. What is the voltage drop across each light bulbÿ
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e. Draw the path of the current on the diagram.
3. What happens to the current in a series circuit as more light bulbs are added? Why?
4. What happens to the brightness of each bulb in a series circuit as additional bulbs are
added? Why? ÿ ÿ
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5. Use the series circuit pictured to the right to answer
questions (a), (b), and (c).
a. What is the total resistance of the circuit?
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What is the current in the circuit?
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b.
What is the voltage drop across each
resistor?
tiÿ 7::; ÿ-6. Use the series circuit pictured to the right to answer
questions (a)-(e).
a. What is the total voltage of the circuit?
b. What is the total resistance of the circuit?
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c. What is the current in the circuit?
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d. What is the voltage drop across each light bulb?
e. Draw the path of the current on the diagram. /...//
7. Use the series circuit pictured right to answer questions
(a), (b), and (c). Consider each resistor equal to all others.
a. What is the resistance of each resistor?
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b. What is the voltage drop across each resistor?
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8. Use the series circuit pictured right to answer questions
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a. What is the total resistance of the circuit?
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b. What is the current in the circuit?
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c. What is the voltage drop across each resistor?
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d. What is the sum of the voltage drops across the three
resistors? What do you notice about this sum?
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9. Use the diagram to the right to answer
questions (a), (b), and (c).
a. How much current would be measured
ev
in each circuit if each light bulb has a
resistance of 6 ohms?
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would be measured
in each circuit if each light bulb has a
resistance of 12 ohms?
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c. What happens to the amount of current
in a series circuit as the number of batteries increases?
Two resistances, one 23 12 and the other 10 12 are connected in parallel With a 9 V battery.
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What is the equivalent resistance of the parallel combmat,on? ]- ÿ ÿ Oÿ!
What is the Total Current?
cÿ How many volts travel down each branch?
How much Current travels down each Branch?
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(Parallel Circuits)
1. Use the parallel circuit pictured right to answer
questions (a) - (d).
a. What is the voltage across each bulb?
b. What is the current in each branch?
c. What is the total current provided by the battery?
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d. Use the total current and the total volÿyge to
calculate the total resistance of the circuit.
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2. Use the parallel circuit pictured right to answer
questions (a) - (d).
ao What is the voltage across each bulb?
b. What is the current in each branch?
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c. What is the total current provided by the battery?
d. Use the total current and the total voltage to ,ÿ
calculate the total resistance of the circuit. ÿ(ÿ'ÿ.ÿ.-ÿLÿ
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3° Use the parallel circuit pictured right to answer
questions (a) - (d),
a, What is the voltage across each resistor?
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b. What is the current in each branch?
c. What is the total current provided by the
batteries?
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d. Use the total current and the total voltage to calculate the total resistance of the
circuit°
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4. Use the parallel circuit pictured right to answer
questions (a) - (c).
a. What is the voltage across each resistor?
b. What is the current in each branch?
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c, What is the total current provided by the
battery?
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