2-4 Electricity in the home (2.3)

Electricity in the home
(p. 70)
Stationary
- Writing book and iPad
- Pen, pencil and geotrianlge
- Calculator


Schoolbags in
the cupboard
Phones in the phone bag
Bluetooth 
- ON
- VPN off
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Slide 1: Diapositive
NatuurkundeMiddelbare schoolhavoLeerjaar 2

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Electricity in the home
(p. 70)
Stationary
- Writing book and iPad
- Pen, pencil and geotrianlge
- Calculator


Schoolbags in
the cupboard
Phones in the phone bag
Bluetooth 
- ON
- VPN off

Slide 1 - Diapositive

Lesson goals:
  • Explain how an electric circuit is connected in a house.
  • Calculate the total current used in a house.
  • Calcualte the total power used in a house.
  • Explain what is meant with switch wire, neutral wire  
       and live wire.
  • Explain the difference between overloading and 
       short circuit

Slide 2 - Diapositive

Domestic electrical systems
  • There is a network of electrical  
       wiring running through the walls.
  • This usually splits into four circuits
     U = U1 = U2 = U3 = U4 = 230V
  • Each group has its own circuit switch.
  • you can disconnect a circuit from the power line with the circuit switch. This is useful for repairs.

Slide 3 - Diapositive

groter power = greater current


Total power drawn:


P1= 15W    P2= 40W
Ptot=55W
Itotal=I1+I2+I3+I4+...
Ptotal=P1+P2+P3+...

Slide 4 - Diapositive

Ptot=P1+P2+...
=U1I1+U2I2+...
Ptot=UItot

Slide 5 - Diapositive

Slide 6 - Diapositive

Slide 7 - Diapositive

Fasedraaden nuldraad
Brown - live wire
Blue - neutral wire

Brown 230V - Blue no voltage

From the light switch to the lamp there is a black wire
 - Swith wire: Only has a voltage if the switch is on

Slide 8 - Diapositive

Overloading
The current in a circuit may not exceed 16 A. 
If it is more there is a fire danger

Too many appliances = overloading

As long as the total power of all 
apliances does not exceed 3,7kW, it is safe.

Slide 9 - Diapositive

Pmax=UImax
=23016
=3680W
=3,7kW

Slide 10 - Diapositive

Short circuit:
The resistance is too low.
This happens when the current can take a shortcut, therefore bypass the appliance. this results in a low resistance, and therefore in a high current.
 - short circuit: resistance is too
   low, and therefore the current is
   too high.

Slide 11 - Diapositive

Why do washing machines often get their own circuit?
A
They use a high voltage
B
They use a high current
C
They work with water
D
It has a higher risk to short circuit

Slide 12 - Quiz

Why does a toaster NOT have its own group?
A
It draws a low power
B
It works on a low voltage

Slide 13 - Quiz

Now do question (p. 76)
IA
timer
5:00

Slide 14 - Diapositive

Slide 15 - Diapositive

Now do Q 30 (p76)

Slide 16 - Diapositive

Slide 17 - Diapositive

What did you
learn today?

Slide 18 - Carte mentale

             Do the following
      31 (p. 76) and test yourself 2.3
ALS JE KLAAR BENT: Do the test yourself 2.1 and 2.2
timer
1:00
Rules:
  • Do the calculations in your book, answers digital


  • Use your textbook when you get stuck
  • No talking/ discussion

  • What you dont finnish is homework

Slide 19 - Diapositive

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