Transcript ElectricityJeopardy3

Electrostatics
Circuits
Current and
Voltage
Power and
Energy
Misc.
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The Law of Electric Charges states
that like charges _______one
another, unlike charges _______
one another, and charged objects
________ neutral objects.
Answer
1. Repel
2. Attract
3. Sometimes Attract
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What type of overall charge does each of
the pith balls below have? Would the pith
balls below attract, repel or have no effect?
1.
2.
+-
+-
- -
+ ++
Answer
• Pith Ball #1 – Negative
• Pith Ball #2 – Positive
• Attract
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Charging by _______ is
when two objects are
rubbed together and one
object loses electrons, the
other gains electrons.
Answer
Friction
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Show the movement of electrons when the pith ball
is charged by contact.
+
+ + -
+-
Neutral
-
Pith ball and negative strip
Charged Pith Ball
Answer
+
-
Negatively
charged pith ball
-
- +
-
+
+
+ - +-+-
Electrons on the pith
ball repel from the
negative plastic strip.
Electron from the plastic
strip moves on to the
pith ball.
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Show the movement of electrons in the pith ball in
induced charge separation.
++-+Neutral
Pith ball and positive
acetate strip
Pith ball with strip
removed
Answer
+
-
+
+ -
+
+ +-
Pith ball and strip
attract
Neutral
++- +-
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What controls the flow
of electrons in an
electric circuit?
Answer
A switch
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What type of circuit has all of
it’s parts wired to each other
along one path where electrons
must go through each load.
Answer
A series circuit
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In a parallel circuit, the current
leaving the source is _______
amongst the branches and the
voltage gained at the source is
________ to the voltage drop
across each load.
Answer
1. Divided
2. Equal
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Draw a schematic
diagram of 2 cells in
series, 1 closed switch,
1 ammeter and 2 lights
in series.
Answer
See chalk board for
correct answer!
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Draw a schematic diagram of
3 cells in series, 1 open
switch, 2 lights in parallel and
1 voltmeter measuring the
voltage drop across one of
the lights.
Answer
See chalk
board for
answer!
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Electric current is the
________ at which
electrons ________
through a circuit.
Answer
1. Number
2. Pass
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Voltage is the amount of
_______ _____ an
electron gains or loses
between two points in a
circuit.
Answer
Electrical Energy
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The ability to slow down
the flow of electrons in
conductors.
Answer
Resistance
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What is the voltage of an
ipod, that has a resistance
of 5Ω when the current
running through it is
2A?
Answer
Given:
I = 2A
R = 5Ω
Unknown: V=?
V=IxR
V= 2A x 5Ω
V = 10 V
Therefore the voltage
would be 10 V.
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What is the resistance of a
PS3, if a current of 10A runs
through it, when it is
connected to a wall outlet
(120V)?
Answer
Given:
V= 120V
I = 10A
Unknown: R= ?
R = V/I
R = 120V
10A
R = 12 Ω
Therefore the resistance
would be 12 Ω.
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What is the equation for
electrical energy?
Answer
E = V x I x ∆t
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How much electrical energy
is produced by a flashlight
powered by a 9V battery
with a current of 2A, that
stays lit for 1 hour?
Answer
Given:
V= 18 V I = 2A
t = 1h
Unknown: E = ?
E=VxIxt
E = 9 V x 2A x 1h
E = 18 W h
Therefore the energy
produced is 18 W h.
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A stereo was accidentally left
on half a day (12 hrs). If the
stereo used 5000Wh of
energy, what is the power
rating of the stereo?
Answer
Given:
E=5000W h
t=12h
Unknown: P=?
P=E/t
P = 5000 W h
12h
P = 416.7W
Therefore the power
rating for the stereo is
416.7 W.
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If an X-box uses 5kWh
of electrical energy and
the rate is $0.08/kWh.
What is the cost to use
the X-box?
Answer
Given:
E= 5kWh
Rate = $0.08/kWh
Unknown: Cost=?
Cost=E x rate
Cost = 5 kWh x $0.08/kWh
Cost = $0.40
Therefore the cost to use the
X-box is $0.40.
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What is the percent
efficiency of a toaster if the
useful energy output is
10000J and the total
energy input is 20000J?
Answer
Given:
Useful energy output = 10000 J
Total energy input = 20000 J
Unknown: Percent Efficiency =?
% efficiency = Useful energy output
x 100%
Total energy input
% efficiency = 10000 J
x 100 %
20000 J
% efficiency = 50 %
Therefore the % efficiency of the
toaster is 50 %.
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What are materials called
that don’t allow electrons to
move freely from atom to
atom?
Examples: Wood, Rubber
Answer
Insulators
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What are materials called
that allow charges to move
freely from atom to atom?
Example: Copper
Answer
Conductors
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What is one renewable
energy source?
Answer
• Hydroelectricity
• Solar Power
• Wind
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What are two largescale sources of
electrical energy?
Answer
•
Fossil Fuel Generating Stations
• Nuclear Generating Stations
• Hydroelectric Generating Stations
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It detects stray or leaking
electrical current that could
cause a dangerous shock
and shuts off power quickly.
(It should be installed where water and electricity are
near each other.)
Answer
Ground Fault
Circuit Interrupter
(GFCI)
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