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YR2_T2_LSN4
Get ready:
Your Macbook (go to Kwizl)
Place your textbook at the corner of your table
Your notebook &
textbook closed!
1 / 33
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Slide 1:
Slide
Science
Middelbare school
havo, vwo
Leerjaar 2
This lesson contains
33 slides
, with
interactive quizzes
,
text slides
and
1 video
.
Lesson duration is:
45 min
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Items in this lesson
Get ready:
Your Macbook (go to Kwizl)
Place your textbook at the corner of your table
Your notebook &
textbook closed!
Slide 1 - Slide
YR2_T2_LSN4
Topic 2.3 Electricity
Slide 2 - Slide
Plan for today:
Homework check
Practice quiz Kwizl (T2.1 & 2.2)
Correct homework
Explanation T2.3 Electricity
Make homework
Slide 3 - Slide
Homework check:
Everyone hands in their textbook
Slide 4 - Slide
Practice quiz on Kwizl
10 min max practice quiz.
5 min max peer review/feedback
Done? Write the following in your notebook:
What mistakes did I make?
Why were they mistakes?
What can I do better next time?
timer
15:00
Slide 5 - Slide
Correct your homework
Answers for topic 2.3 are in the classroom
Correct your answers in a
different color
(Answer wrong? write down the correct answer in the different color)
timer
10:00
Slide 6 - Slide
Learning goals
I can…
Explain what electrical energy is made of.
Explain what current is, along with its unit of measurement.
Explain what voltage is, along with its unit of measurement.
Slide 7 - Slide
Key words
Electricity
Electrons
Electrical current (I)
Ampères (A)
Voltage (U)
Volts (V)
Voltage source
Power (P)
Watt (W)
Energy
Slide 8 - Slide
Slide 9 - Video
What is electricity?
Electricity
is caused by the flow of electrons moving through a conducting material
Those electrons go from the power source to the device
In the appliance they leave their energy behind
They go back to the power source to be charged.
Slide 10 - Slide
Slide 11 - Slide
What is an insulator?
A
A material that does not conduct electricity
B
A material that conducts electricity
C
A clamp to connect two electric wires
D
An electric source
Slide 12 - Quiz
Electric wire
The plastic around the wire is an
insulator
(cable jacket and wire insulation)
The coper wire is a
conductor
(stripped wire)
Slide 13 - Slide
Current
A
current (I)
is how many electrons flow past every second.
Measured in
Amps (A)
with an ammeter
Slide 14 - Slide
Voltage
Voltage (U)
is how much electrical energy each electron is carrying.
Measured in
Volts (V)
with a voltmeter
Slide 15 - Slide
How many voltage is in a power outlet at your home?
Slide 16 - Mind map
Voltage
The power outlet has a voltage of
230V
This can be
dangerous
and even
deadly
24V is the safe limit
Transformers raise/lower voltage
Slide 17 - Slide
Power
Power (P)
is the amount of electrical energy used per second by a device.
Measured in
Watts (W)
Watts is also J/s (joules per second)
Slide 18 - Slide
Calculate Power
Power can be calculated with the formula:
P = U x I
P for Power (in W)
U for Voltage (in V)
I for current (in A)
Slide 19 - Slide
A device has a battery of 12V. There is a current going through the devies of 5A. What is the power of this device?
Slide 20 - Open question
Energy cosumption
All electrical devices use energy → energy consumption
The amount of energy can be calculated with the formula:
E = P · t
E = Energy (in Joules)
P = Power (in W)
t = time (in s)
Slide 21 - Slide
Energy cosumption
An electric kettle using a current of 2.17 A takes 1 minute and 54 seconds to boil the water.
Calculate the energy consumption of the kettle in kJ.
Slide 22 - Slide
Energy cosumption
An electric kettle using a current of 2.17 A takes 1 minute and 54 seconds to boil the water.
Calculate the energy consumption of the kettle in kJ.
Answer:
E = P · t
P = U · I = 230 · 2.17 = 499.1 W
t = 60 + 54 = 114 s
E = 499.1 · 114
P = 56 897 J = 56.9 kJ
Slide 23 - Slide
Energy
Power
Time
Voltage
current
I
P
U
E
t
Slide 24 - Drag question
What part of an atom makes it possible for electrical energy to travel?
A
Proton
B
Nucleon
C
Muon
D
Electron
Slide 25 - Quiz
The formula is P = U x I
Wich of these is also correct?
A
U = I / P
B
U = P x I
C
U = P / I
D
U = P + I
Slide 26 - Quiz
What is the Voltage of a power outlet in a house?
A
360 V
B
12 V
C
230 V
D
1500 V
Slide 27 - Quiz
A telephone has a 15V battery. Its power in low energy mode is 45W.
What is the current in the telephone?
Slide 28 - Open question
Slide 29 - Slide
phet.colorado.edu
Slide 30 - Link
Assignment
Make the following circuits work in the app: "Inleiding"
let a lightbulb burn with a battery
let a lightbulb burn with a battery and a switch
let 2 lightbulbs burn with a battery and a switch
timer
5:00
Slide 31 - Slide
There is a electrical current when...
A
the circuit is closed
B
when there is a electric source
C
when the wires are conductors
D
all three need to be true
Slide 32 - Quiz
Homework
Read Topic 2.3 (p. 70-73)
Complete the exercise of Topic 2.3 (p.74-77)
Study the glossary of Topic 2.3 on StudyGo.
Slide 33 - Slide
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