2-10 Safety in the house (2.4)

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Slide 1: Diapositive
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

Cette leçon contient 25 diapositives, avec quiz interactifs et diapositives de texte.

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Online lesson etiquette
1. Be on time
2. Have book, pens etc ready beside you.
3. Camera on, microphone off.
4. Put up hand icon to talk or talk when asked.
5. Chat is only for lesson material.

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                       Lesson goals:
- Distinguish between a circuit overload and a short circuit.

- Explain why an extention cord must be rolled out before use.

- Explain what the purpose of a fuse is.

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Fire
  • When more appliances are connected to a socket,  a greater current will be used (circuit overload).
  • If the current is more than 16 A - it becomes a fire hazard.
  • The input cable becomes too hot and could catch fire.

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Short circuit
When the current does not go through the appliance.

The current returns to the socket, without moving through the appliance.


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Extention cord
Must be fully unrolled, otherwise the heat can not escape.

Pmax

Pmin

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Fuses
An electric installation is protected from short circuits and overloads.  

Fuse
- Electronic
- Melt (ceramic) fuses

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Short circuit or circuit overload?
A
short circuit
B
circuit overload

Slide 14 - Quiz

short circuit or circuit overload?
A
short circuit
B
circuit overload

Slide 15 - Quiz

When more appliances are connected to one electric socket, the current in each appliance becomes less.
A
true
B
false

Slide 16 - Quiz

When too many appliances are connected to a socket, the fuse will switch the current off.
A
true
B
false

Slide 17 - Quiz

The electric wires going to a light fitting, heat up a bit when in use.
A
true
B
false

Slide 18 - Quiz

Due to the electricity being split over groups in an electric installation, more appliances can be connected.
A
true
B
false

Slide 19 - Quiz

Houses are equipped with fuses to protect it from short circuits and overloads.
A
true
B
false

Slide 20 - Quiz

Now do  63 up to 65 (p. 88)
timer
10:00
RULES:
  • Write in your writingbook


  • Use: Your textbook
  • question 64, look at the table on p82.

  • In 8 minutes we will discuss the answers

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