Welcome to …
JE
OPAR DY
DY!
EO
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You will choose questions
from
the following
six topic areas:
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What do you know about…
Units
What do you know about…
Circuits
What do you know about…
Heating
What do you know about…
Household/Misc.
Units
Circuits
Heating
Household/
Misc.
10
10
10
10
20
20
20
20
30
30
30
30
40
40
40
40
50
50
50
50
FINAL QUESTION
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Units f o r
10 points …
What is the unit
for current?
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The
correct
answer
is…
Amperes or Amps
10
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Units f o r 2 0 p o i n t s …
What is the unit for
energy?
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The
correct
answer
is…
Joules
20
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Units f o r 3 0 p o i n t s …
What is the unit
for Voltage?
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The
correct
answer
is…
Volts (of course)
30
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Units f o r 4 0 p o i n t s …
What is the unit
for power?
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The
correct
answer
is…
Watt
40
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Units f o r 5 0 p o i n t s …
What does the unit
for power represent?
And what therefore
are the unit of
power’s units?
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The
correct
answer
is…
Amount of energy per unit time, so it
is J/s.
50
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Circuits f o r
10 points …
What is the definition
of a circuit?
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The
correct
answer
is…
A closed loop along which an
electrical current flows
10
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Circuits f o r
20 points…
What are the two types
of circuits?
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The
correct
answer
is…
Series and parallel
20
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2:30
Circuits f o r 3 0 p o i n t s …
The diagram below
shows two circuits,
what type is each one?
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The
correct
answer
is…
30
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Circuits f o r 4 0 p o i n t s …
What is the
formula for
Ohm’s Law?
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The
correct
answer
is…
V = IR
40
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Circuits f o r 5 0 p o i n t s …
Using Ohm’s Law, if a
lightbulb in a house provides
5 Ohms of resistance, what
current must be passing
through it?
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The
correct
answer
is…
V
I
R
So I = V/R.
In a house, V = 110 Volts, so
I = 110/5 = 22 Amps
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50
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Heating f o r 1 0 p o i n t s …
What is specific
heat?
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The
correct
answer
is…
The amount of energy you
need to raise the temperature
of a substance.
10
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Heating f o r 2 0 p o i n t s …
Which has a higher
specific heat, water
or aluminum?
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The
correct
answer
is…
Water (it is harder to heat
up)
20
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Heating f o r 3 0 p o i n t s …
What formula have we been
using for calculating heat
energy?
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The
correct
answer
is…
HE = m*c*ΔT
HE = heat energy
m = mass of substance
c = specific heat
ΔT = change in temperature
30
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Heating f o r 4 0 p o i n t s …
Two Heating are acting on
a skydiver – a 700 N force
downward due to gravity
and a 100 N force
upwards due to air
resistance. What is her
net force?
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The
correct
answer
is…
Her net force is 600 N downwards.
40
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Heating f o r 5 0 p o i n t s …
A 100 kg skydiver is being
accelerated 10 m/s2 downward
due to gravity while air
resistance is pushing up on
her with 1000 N of force. What
is the net force on her?
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The
correct
answer
is…
The net force on her is zero.
From F = ma, she has 100 * 10 = 1000
N upwards which balances the
downward force.
50
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Household/Misc. f o r 1 0 p o i n t s …
Name three household
appliances that use a
lot of energy.
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The
correct
answer
is…
There are of course a lot of correct
answers. Here’s what I came up
with: Hot water heater, stove, air
conditioner, baseboard heater or
radiator, refrigerator
10
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Household/Misc. f o r 2 0 p o i n t s …
What is a Kilowatt-hour
measuring?
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The
correct
answer
is…
Energy. A Watt is energy/time, so a
watt-hour would be energy/time *
time. We can cancel time and we
just have energy.
20
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Household/Misc. f o r 3 0 p o i n t s …
In Boston, when would you
expect to have the highest
energy bills and why?
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The
correct
answer
is…
January and February
(the coldest months).
This is because it takes
a lot of energy to heat
a house.
30
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Household/Misc. f o r 4 0 p o i n t s …
What is the formula for
power?
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The
correct
answer
is…
P = IV
40
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Household/Misc. f o r 5 0 p o i n t s …
When heating up water
in a stove, some heat
energy is lost and
doesn’t go into heating
the water. Where could
this lost energy go?
(Need two correct
answers)
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The
correct
answer
is…
Two main losses are to the air and to
the pot. There is also energy lost to
evaporation as the water heats up.
50
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Last Question
THE FINAL QUESTION
If we try to heat 1 kg of water 10
°C, with a 400 Watt water
heater, how long will it take?
The specific heat of water is
about 4000 J/kg/ °C. Assume no
heat is lost (100% efficiency).
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The
correct
answer
is…
The amount of energy input can be found from
HE = m*c*ΔT = 1 * 4000 * 10 = 40000 J.
A Watt (power) is energy/time. We can
rearrange so time = energy/power.
We can plug in then: time = 40000/400 =
100 seconds – between one and two
minutes.
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