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2 YR2_T2_LSN6 2.3
YR2_T2_LSN6
Topic 2.3 Electricity
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Middelbare school
havo, vwo
Leerjaar 2
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YR2_T2_LSN6
Topic 2.3 Electricity
Slide 1 - Diapositive
Planning for today
Topic 2.3 Electricity
Test Topic 1 review
Bean Project
Slide 2 - Diapositive
Learning goals 2.3
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 3 - Diapositive
Key words
Electricity
Electrons
Electrical current (I)
Ampères (A)
Voltage (U)
Volts (V)
Voltage source
Power (P)
Watt (W)
Energy
Slide 4 - Diapositive
Slide 5 - Vidéo
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 6 - Diapositive
Slide 7 - Diapositive
Electric wire
The plastic around the wire is an
insulator
(wire insulation)
The coper wire is a
conductor
(stripped wire)
Slide 8 - Diapositive
Voltage
Voltage (U)
is how much electrical energy each electron is carrying.
Measured in
Volts (V)
with a voltmeter
Slide 9 - Diapositive
Current
A
current (I)
is how many electrons flow past every second.
Measured in
Amps (A)
with an "ammeter" (amperemeter)
Slide 10 - Diapositive
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 11 - Diapositive
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 12 - Diapositive
Calculate Power
Power can be calculated with the formula:
P = U x I
P for Power (in W = Watt)
U for Voltage (in V = Volt)
I for current (in A = Ampere)
Slide 13 - Diapositive
Energy consumption
All electrical devices use energy → energy consumption
The amount of energy can be calculated with the formula:
E = P · t
E = Energy (in J = Joules)
P = Power (in W = Watt)
t = time (in s = seconds)
Slide 14 - Diapositive
Question 1
A device has a battery of 12V. There is a current going through the devies of 5A. What is the power (P) of this devies?
Slide 15 - Diapositive
Calculation 1
A device has a battery of 12V. There is a current going through the devies of 5A. What is the power (P) of this devies?
Answer:
P = U x I
Slide 16 - Diapositive
Calculation 1
A device has a battery of 12V. There is a current going through the devies of 5A. What is the power (P) of this devies?
Answer:
P = U x I
U = 12 V
I = 5 A
Slide 17 - Diapositive
Calculation 1
A device has a battery of 12V. There is a current going through the devies of 5A. What is the power (P) of this devies?
Answer:
P = U x I
U = 12 V
I = 5 A
P = 12V x 5A = 60W
Slide 18 - Diapositive
Question 2
A telephone has a 15V battery. Its power in low energy mode is 45W.
What is the current in the telephone?
Slide 19 - Diapositive
Calculation 2
A telephone has a 15V battery. Its power in low energy mode is 45W.
What is the current in the telephone?
Answer:
P = U x I
Slide 20 - Diapositive
Calculation 2
A telephone has a 15V battery. Its power in low energy mode is 45W.
What is the current in the telephone?
Answer:
P = U x I -> I = P / U
Slide 21 - Diapositive
Calculation 2
A telephone has a 15V battery. Its power in low energy mode is 45W.
What is the current in the telephone?
Answer:
P = U x I -> I = P / U
U = 15 V
P = 45 W
Slide 22 - Diapositive
Calculation 2
A telephone has a 15V battery. Its power in low energy mode is 45W.
What is the current in the telephone?
Answer:
P = U x I -> I = P / U
U = 15 V
P = 45 W
I = P / U = 45W / 15V = 3A
Slide 23 - Diapositive
Question 3
An electric kettle using a current of 2,22 A takes 1 minute and 24 seconds to boil the water.
Calculate the energy consumption of the kettle in kJ.
Slide 24 - Diapositive
Calculation 3
An electric kettle using a current of 2,22 A takes 1 minute and 24 seconds to boil the water. Calculate the energy consumption of the kettle in kJ.
Answer:
U = 230 V (from the socket); I = 2,22A
Slide 25 - Diapositive
Calculation 3
An electric kettle using a current of 2,22 A takes 1 minute and 24 seconds to boil the water. Calculate the energy consumption of the kettle in kJ.
Answer:
U = 230 V (from the socket); I = 2,22A
P = U x I = 230 x 2,22 = 510,6 W
t = 60 + 24 = 84 s
Slide 26 - Diapositive
Calculation 3
An electric kettle using a current of 2,22 A takes 1 minute and 24 seconds to boil the water. Calculate the energy consumption of the kettle in kJ.
Answer:
U = 230 V (from the socket); I = 2,22A
P = U x I = 230 x 2,22 = 510,6 W
t = 60 + 24 = 84 s
E = P x t
E = 510,6 x 84
P = 42 890 J = 42,9 kJ
Slide 27 - Diapositive
Calculation 3
An electric kettle using a current of 2,22 A takes 1 minute and 24 seconds to boil the water. Calculate the energy consumption of the kettle in kJ.
Answer:
U = 230 V (from the socket); I = 2,22A
P = U x I = 230 x 2,22 = 510,6 W
t = 60 + 24 = 84 s
E = P x t
E = 510,6 x 84
P = 42 890 J = 42,9 kJ
Slide 28 - Diapositive
Calculation 3
An electric kettle using a current of 2,22 A takes 1 minute and 24 seconds to boil the water. Calculate the energy consumption of the kettle in kJ.
Answer:
U = 230 V (from the socket); I = 2,22A
P = U x I = 230 x 2,22 = 510,6 W
t = 60 + 24 = 84 s
E = P x t
Slide 29 - Diapositive
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 30 - Quiz
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 31 - Quiz
Energy
Power
Time
Voltage
Current
I
P
U
E
t
Slide 32 - Question de remorquage
What part of an atom makes it possible for electrical energy to travel?
A
Proton
B
Nucleon
C
Muon
D
Electron
Slide 33 - Quiz
The formula is P = U x I
Which of these is also correct?
A
U = I / P
B
U = P x I
C
U = P / I
D
U = P + I
Slide 34 - 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 35 - Quiz
Slide 36 - Diapositive
phet.colorado.edu
Slide 37 - Lien
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
8:00
Slide 38 - Diapositive
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 39 - Diapositive
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