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Lesson 11
Chapter 1 — Section 4
Electricity and safety
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Physics
Middelbare school
havo, vwo
Leerjaar 3
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Chapter 1 — Section 4
Electricity and safety
Slide 1 - Diapositive
Chapter 1 — Section 4
Electricity and safety
The dangers of electricity
Overloading and short circuiting
Earth leakage circuit breakers
Working independently
Slide 2 - Diapositive
Why is electricity dangerous?
Slide 3 - Diapositive
Why is electricity dangerous?
Slide 4 - Diapositive
Why is electricity dangerous?
Slide 5 - Diapositive
Why is electricity dangerous?
Slide 6 - Diapositive
Dangers of electricity
What is overloading?
What is short-circuiting?
What is the maximum power that can be transfer through a group?
Slide 7 - Diapositive
Overloading
Too many devices running on a group at the same time.
The group draws to much power (too many joules/second).
The current goes above the safety limit (16 A).
The wire heats up to much — Fire.
Slide 8 - Diapositive
Overloading
Too many devices running on a group at the same time.
The group draws to much power (too many joules/second).
The current goes above the safety limit (16 A).
The wire heats up to much — Fire.
What is the maximum power a group can handle?
Slide 9 - Diapositive
Short-circuiting
The current goes straight from the negative pole to the positive pole with barley any resistance in between.
This causes too big a current to flow to the wire.
The wire hets up to much — Fire.
Link
Slide 10 - Diapositive
Slide 11 - Diapositive
Slide 12 - Diapositive
Earth leakage circuit breakers
Slide 13 - Diapositive
Working independently
Study section 1.1 to 1.4
Look at the practice exercises
Do several exercises
Retry some of the homework exercises
Ask any question you have left
The answers to the questions of chapter 1 are on Somtoday!
Slide 14 - Diapositive
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