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Chapter Nine
Review
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1. A circuit is constructed using a cell and two resistors in series. A similar circuit is built
using a cell and two resistors in parallel. Complete the table regarding voltage and
current.
Series Circuit
Use circuit diagrams to
representations of the circuits
description above.
draw
the
in
How does the current running through
the second resistor compare to current
through the first resistor and
the
overall current in the circuit?
How does the voltage on the second
resistor compare to voltage on the first
resistor and the overall voltage of the
circuit?
2.
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Parallel Circuit
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Determine whether the missing part of the statement should be, 'increasesn' 'decreases,o
or'does not change.'
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Answer
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a.
Addins
a
Statement
resi#or in series
the circuit. \
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b. Adding a resistor in series
other resistors in the c-hcui
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d. Removing a resistor in h series
the total resistance
the voltage drop
of
the total resistance
decrulo(
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of
clrcuit
of
the overall
current of the circuit.
resigo{in a parallef circuit
current flo*1ng through tfi.-uttrefputS*uy, of th"
e. Removing a
the
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3. If two pathways
of a parallil circuit have different resistances, will the current in each
pathway be the same? Explain.
)No,
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State the relationship of current, voltage, and
Equation
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Current (I)
power. ,.-..
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Complete the tatrle regarding energy.
State the relationship of time, power, and energy.
State the definition of energy.
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Equation
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Complete the table regarding power.
State the definition of power.
5.
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What two units are used for measuring eleckical energy?
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A circuit is constructed using a battery and two lamps in series. A similar circuit is built
using a battery and two lamps in parallel. Describe what will happen if one bulb burns
out.
Parallel Circuit
Series Circuit
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7.
Determine whether the circirit diagram depicts a series circuit or a parallel circuit.
Explain.
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Describe a non-electric example of a real life situation that represents each of the following.
Series Circuit
Parallel Circuit
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9.
A light bulb is connected to l2A V and uses 1.2 A. Determine the power rating of the bulb.
Formula
p=lr/
Work
= (r.zn )( rL0 t/)
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10. Determine the voltmeter readings at
vr: 5 0/ A
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Final Answer
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Vl and the ammeter readings at Ar for each circuit.
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11. Determine the
current thro'ugh a 1200 W hair dryer if it is connected to 120 V.
Formula
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12.
Work
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Final Answer
/200 w
/LO V
f=
3
A current of 6 A runs through a 660 W toaster. Determine the voltage across the toaster.
Formula
Work
Final Answer
v=
L3. Determine the power
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rating of each lamp in the circuit.
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A current of 0.20 A flows through a 450
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t/= //0
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Lamp 1 Power Rating
14.
f = /0Ae
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(0,
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Lamp 2 Power Rating
/=
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f! resistor. calculate the power.
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p= tf vu
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in both small and large quantities. Include the
units of measurement for energy, power and time.
15. Describe how energlr can be measured
Small Quantities of Energy
Large Quantities of Energy
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16. How many joules is 5
kitowitt.hours equal to? Show the calculation.
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17.
If the cost of enerry
is 9 cents per
Power
Appliance
fuA O /000
kW.h. Complete the table regarding
Duration
Stove
s.0
kw
2.0 h
Water Heater
0_2
kw
8.0 h
Hair Dryer
0.4
kw
Light Bulb
100w0.t t/V
Microwave
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18.
A
100
Cost (d)
o kwt,
/. 0 kwA
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/
min$.(l
0.2 kwl
0.0
6.0h
tz
Enerry (kw.h)
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4
kwt
54d
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4.e4 d
cost of electricity.
Cost ($)
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6
€ 0.o{
to.0L
W light'bulb is left on for 90 minutes. Calculate the energy consumption, in joules.
Work
Formula
P=ld
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30
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Final Answer
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A light bulb consumes 648 000 J of energy over 3 hours. Find power rating of the bulb.
Final Answer
E
T
6'/tr ooo
d
/o 900 Iee.
P= 6o
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