electrical safety summary 3H

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Slide 1: Diapositive
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

Cette leçon contient 32 diapositives, avec quiz interactifs, diapositives de texte et 1 vidéo.

time-iconLa durée de la leçon est: 45 min

Éléments de cette leçon

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.

Slide 1 - Diapositive

Lessonup.app
put in the code

Slide 2 - Diapositive

Slide 3 - Diapositive

Cable reel extension cord
Must be fully unrolled, otherwise the heat can not escape.
overheating is a fire hazard.




Slide 4 - Diapositive

circuit overload is when the electrical wires get too hot
A
True
B
false

Slide 5 - Quiz

Overhead power lines are very thick so they have low resistance.
A
True
B
False

Slide 6 - Quiz

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

Slide 7 - Quiz

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

Slide 8 - Quiz

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

Slide 9 - Quiz

Slide 10 - Diapositive

Slide 11 - Diapositive

Fuses
Fuses protect from short circuits and overloads
 Most fuses are 16A
At mains 230 V, that means max power of 16 A fuse is.
P = U x I = 230 V x 16 A
   = 3 680 Watts per fuse


Slide 12 - Diapositive

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

Slide 13 - Quiz

Most of the fuses in our consumer unit (meterkast) can handle max current
of
A
3A
B
1A
C
16A
D
230V

Slide 14 - Quiz

The maximum power for a group in a fuse box is found using P = U x I
A
true
B
false

Slide 15 - Quiz

For a 16 amp fuse the maximum power is 16kWh
A
true
B
false

Slide 16 - Quiz

A fuse is a safety feature to prevent a high current flowing through your body.
A
True
B
False

Slide 17 - Quiz

Too many appliances plugged into one socket can cause.
A
lights to go dim
B
overload
C
short circuit

Slide 18 - Quiz

Slide 19 - Vidéo

earth = green/yellow ( think grass)
neutral =blue (think water)   live= brown

Slide 20 - Diapositive

Slide 21 - Diapositive

An earth leakage circuit breaker protects you from electric currents through your body
A
True
B
False

Slide 22 - Quiz

Thi
A
This plug is earthed
B
This plug is not earthed

Slide 23 - Quiz

What colour is the earth wire?
A
green/yellow
B
brown
C
blue

Slide 24 - Quiz

What colour is the live wire?
A
green/yellow
B
brown
C
blue

Slide 25 - Quiz

the blue wire is the ..
A
earth
B
neutral
C
live

Slide 26 - Quiz

If the plastic coating on a wire is damaged this can cause
A
a short circuit
B
overload
C
sparking danger

Slide 27 - Quiz

 page 74, questions
130
131 a
132 a,b
Check answers on Som

Slide 28 - Diapositive

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

Slide 29 - Quiz

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

Slide 30 - Quiz

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.

Slide 31 - Diapositive

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

Slide 32 - Quiz