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Physics Unit Review
Static Charge
► What
is the definition of static electricity?
A: An excess of charges that stay in
place on an object for a period of time.
► Is the object positively, negatively, or
neutrally charged?
A: Neutrally charged
► How
are all solid materials charged?
A: The transfer of electrons.
► Materials
that do not allow charges to move
easily are called _________?
A: Insulators
► What
are good conductors?
A: Metals
Charge
► What
does the addition or removal of
6.25 x 1018 electrons produce?
A: A coulomb of charge.
► What
machine uses friction to produce a
large static charge on a metal dome called?
A: Van de Graaff generator
Laws of Static Charge
A negative charge is repelled by a __________ charge.
A: A negative charge.
► A positive charge _________________a negative charge.
A: Attracts
► A charged object _______________ a neutral object.
A: Attracts
► A negative object attracts an unknown object. The
unknown object could be ____________ or ___________.
A: Neutral or positive charge
► A positive object ________________ a positive object.
A: Repels
►
Charging by Conduction or Induction
► Which
of the diagrams shows charging by
induction?
A: A and D
Voltage
► What
energy does electrochemical cells
convert into electrical energy?
A: Chemical energy
► What
is another name for the electric
potential energy per coulomb of charge?
A: Voltage
Voltage
► Calculate
A: 35 V
the voltage for the diagram found below.
Voltage
► Calculate
below.
A: 9 V
the voltage for the diagram found
Circuits
►A
complete pathway that allows electrons to flow
is called _________?
A: Electric circuit
► Any
device that transforms electrical energy into
other forms of energy is called ______?
A: Electric load
► What
direction do electrons flow through a circuit?
A: Negative to positive.
Circuits
► State
the parts of the circuit found in the diagram
below.
A: 2 lamps, a switch, a battery, an ammeter,
and a voltmeter
Current
► Define
current.
A: The amount of charge passing a point in a
conductor every second.
► Convert
2400 mA to amperes.
A: 2.4 A
► Convert
0.35 A to mA.
A: 350 mA
Current
► Calculate
A: 4 A
the current at I3.
Current
► Calculate
the current at I2, I3, and I5.
A: I2 and I3 = 6A and I5 = 2A
Resistance
► Define
resistance.
A: A property of any material that slows down
the flow of electrons and converts electrical
energy into other forms of energy.
► State
Ohm’s Law.
A: R = V/I
► What
is the unit for resistance?
A: Ohm’s
Colour
Numeric
Value
►
a)
A:
b)
A:
c)
A:
Black Brown Red Orange Yellow Green Blue
0
1
2
3
4
5
6
Give the value of each resistor indicated by the
colour bands.
Blue, green, red
652 ohms
Green, orange, yellow
534 ohms
Brown, red, black
12 ohms
Ohm’s Law
► Only
2.5 × 103 A of current pass
through a portable CD player. If the CD
player is operated by a 9.0 V battery, what
is the resistance within the circuit?
A: 3600 ohms
Ohm’s Law
► An
automobile headlight has an average
resistance of 24 . Car batteries provide a
potential difference of 12 V. What amount of
current passes through the headlight?
A: 0.5 A
Ohm’s Law
► In
a portable radio, 0.50 A of
current are flowing through a conductor
that provides 18  of resistance. What
potential difference is provided by the
battery?
A: 9V
Series Circuit
► In
a series circuit, the current at one
location in the circuit is ________the
current at another location in the circuit.
A: Equal to
► If two different resistors are connected in
series, the voltage across one resistor will
be _________ the voltage across the
second resistor.
A: Different from
Parallel Circuits
► If
two different resistors are connected in parallel,
the voltage across one resistor will be
_________the voltage across the second resistor.
A: Equal to
► Two different resistors are connected in parallel.
The current through one of the resistors will be
__________ the current through the other resistor.
A: Different from
Series and Parallel Circuits
► Which
bulbs are in parallel?
A: 3, 4, and 5
Series Circuit
► Calculate
below.
the missing quantities for the circuit
A: V1 = 7.5V; R1 = 5 ohms; R2 = 3 ohms
Parallel Circuit
► Calculate
the missing quantities for the
circuit below.
A: V1 and V2 = 40 V and R1 = 2 ohms
Power
►A
current of 5.0 A flows through a flashlight bulb
when it is connected to 6.0 V. What is
the power of this bulb?
A: 30 watts
► A 600 W electric heater is connected to a 120 V
source. What current flows through the heater?
A: 5 A
► 2.5 A current flows through a 100 W lamp. What is
the voltage across the lamp?
A: 40 V
Cost of Electricity
► An
electric heater draws 1300 W of power.
Electricity costs 10¢ per kWh. How much does it
cost to operate the heater 5.0 h a day for 30
days?
A: $19.50
► A dryer is used an average of 25.0 h a month. The
dryer draws 45.0 A of current from a 120 V outlet.
If electricity costs 8¢ per kWh, how much will it
cost to operate the dryer for one year?
A: $129.60