YR2_T2_LSN4

Get ready:
  • Your Macbook (go to Kwizl)
  • Place your textbook at the corner of your table


Your notebook &  textbook closed!
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Slide 1: Tekstslide
ScienceMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 33 slides, met interactieve quizzen, tekstslides en 1 video.

time-iconLesduur is: 45 min

Onderdelen in deze les

Get ready:
  • Your Macbook (go to Kwizl)
  • Place your textbook at the corner of your table


Your notebook &  textbook closed!

Slide 1 - Tekstslide

YR2_T2_LSN4
Topic 2.3 Electricity

Slide 2 - Tekstslide

Plan for today:
  • Homework check
  • Practice quiz Kwizl (T2.1 & 2.2)
  • Correct homework
  • Explanation T2.3 Electricity
  • Make homework 

Slide 3 - Tekstslide

Homework check:
Everyone hands in their textbook

Slide 4 - Tekstslide

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 - Tekstslide

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 - Tekstslide

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 - Tekstslide

Key words
Electricity
Electrons
Electrical current (I)
Ampères (A)
Voltage (U)
Volts (V)
Voltage source
Power (P)
Watt (W)
Energy

Slide 8 - Tekstslide

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 - Tekstslide

Slide 11 - Tekstslide

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 - Quizvraag

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 - Tekstslide

Current
A current (I) is how many electrons flow past every second.
 
Measured in Amps (A) with an ammeter

Slide 14 - Tekstslide

Voltage
 Voltage (U) is how much electrical energy each electron is carrying. 
 
Measured in Volts (V) 
with a voltmeter

Slide 15 - Tekstslide

How many voltage is in a power outlet at your home?

Slide 16 - Woordweb

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 - Tekstslide

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 - Tekstslide

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 - Tekstslide

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 vraag

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 - Tekstslide

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 - Tekstslide

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 - Tekstslide

Energy
Power
Time
Voltage
current
I
P
U
E
t

Slide 24 - Sleepvraag

What part of an atom makes it possible for electrical energy to travel?
A
Proton
B
Nucleon
C
Muon
D
Electron

Slide 25 - Quizvraag

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 - Quizvraag

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 - Quizvraag

A telephone has a 15V battery. Its power in low energy mode is 45W.
What is the current in the telephone?

Slide 28 - Open vraag

Slide 29 - Tekstslide

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 - Tekstslide

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 - Quizvraag

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 - Tekstslide