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PHY101
Chapter 7 Review
Study of Electricity
By Cheryl Dellai
Study of Electricity
Basics
E Field
Circuit
Elements
Equations
Problems
Potpourri
$100
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Basics
$100
What is the basic unit of
charge?
ANSWER
Basics
$200
Like charges (repel/attract)
ANSWER
Basics
$300
What is meant by Conservation
of Charge?
ANSWER
Basics
$400
What is Coulomb’s Law?
ANSWER
E Field
$100
What is the definition of an
Electric Field?
ANSWER
E Field
$200
Electric field lines start on
____ charges and end on ____
charges or infinity.
ANSWER
E Field
$300
The energy per unit charge
supplied by a battery is its
________ .
ANSWER
E Field
$400
What kind of charge is at the
center of this picture?
ANSWER
Circuit Elements
$100
What is the definition of
conventional current?
ANSWER
Circuit Elements
$200
What is a battery?
ANSWER
Circuit Elements
$300
What is a resistor?
ANSWER
Circuit Elements
$400
Suppose current is flowing in
a wire from right to left.
Which way do the electrons in
the wire move?
ANSWER
Equations
$100
What is Ohm’s Law?
ANSWER
Equations
$200
What is the Power Equation?
ANSWER
Equations
$300
What is the Power Usage
equation?
ANSWER
Equations
$400
Complete Table
Use Add, Add Reciprocally
table
SeriesR, Same to complete
Parallel
Charge/Current
Voltage
Resistance
ANSWER
Problems
$100
The light bulbs in this circuit
are connected in _______.
ANSWER
Problems
$200
The light bulbs in this circuit
are connected in ____ .
ANSWER
Problems
$300
A battery operating a large flashlight
produces a current of 2 amperes in a
light bulb that has a resistance of 4
ohms. The voltage of the battery
is_______ .
ANSWER
Problems
$400
Two charged bodies separated by a
distance d exert an electrical force on
each other. The distance d is doubled.
The electrical force on each body is
now ____ times the original force.
ANSWER
Potpourri $100
Name 2 types of current.
ANSWER
Potpourri $200
What does a transformer do?
ANSWER
Potpourri $300
If the temperature of a wire
increases, its resistance
_________ .
ANSWER
Potpourri $400
Lightning is dangerous to
humans because lightning
strokes have ________
ANSWER
Basics
$100
Answer
What is the basic unit of charge?
Coulomb
Basic Charges
Proton
p+ = +1.6*10-19C
Electron e- = - 1.6*10-19C
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Basics
$200
Answer
Like charges (repel/attract).
Repel
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Basics
$300
Answer
Conservation of Charge
Net charge of universe is zero.
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Basics
$400
Answer
What is Coulomb’s Law?
F = kEq1q2/d²
kE =9.0 *109 N*m²/C²
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E Field
$100
Answer
What is the definition of an
Electric Field?
E=F/q
E = kEq/d² for a pt charge
SI Unit is N/C or Volts/m
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E Field
$200
Answer
Electric field lines start on +
charges and end on - charges
or infinity.
A positive follows the electric field lines.
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E Field
$300
Answer
The energy per unit charge
supplied by a battery is its
voltage.
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E Field
$400
Answer
What kind of charge is at the
center of this picture?
It is positive.
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Circuit Elements
$100
Answer
What is the definition of
conventional current?
Flow of positive charge even when the charge is
negative.
SI unit 1 C/s = ! Amp = A
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Circuit Elements
$200
Answer
What is a battery?
A battery is a device that supplies energy to a
circuit by chemical reaction.
EMF is Energy/Charge
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The SI is 1J/C = 1 Volt.
Circuit Elements
$300
Answer
What is a resistor?
A device that opposes the flow of current.
Resistance R = V/I
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1 Volt/Amp = 1 ohm = 1
Circuit Elements
$400
Answer
Suppose current is flowing in a
wire from right to left.
Which way do the electrons in
the wire move?
Left to right
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Equations
$100
Answer
What is Ohm’s Law?
V = IR
R is constant
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Equations
$200
Answer
What is the Power Equation?
Power = IV =I²R = V²/R
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Equations
$300
Answer
What is the Power Usage
equation?
Energy = Power*Time
1 kW*h = 3,600,00 J = 3.6 MJ
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Equations
$400
Answer
Complete Table
Use Add, Add Reciprocally R, Same to complete table
Series
Parallel
Charge/Current
Same
Add
Voltage
Add
Same
Resistance
Add
Add R
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Problems
$100
Answer
The light bulbs in this circuit
are connected in parallel.
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Problems
$200
Answer
The light bulbs in this circuit
are connected in series.
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Problems
$300
Answer
A battery operating a large flashlight
produces a current of 2 amperes in a light
bulb that has a resistance of 4 ohms.
The voltage of the battery is_______ .
V = IR = 8 Volts
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Problems
$400
Answer
Two charged bodies separated by a
distance d exert an electrical force on
each other. The distance d is doubled.
The electrical force on each body is
now 0.25 times the original force.
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Potpourri $100
Answer
Name 2 types of current.
DC and AC
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Potpourri $200
Answer
What does a transformer do?
Step up or down voltage in AC circuit.
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Potpourri $300
Answer
If the temperature of a wire
increases, its resistance
increase.
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Potpourri $400
Answer
Lightning is dangerous to
humans because lightning
strokes have large current.
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Study of Electricity
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