Lesson 11

• Physics
• Middelbare school
• havo, vwo
• Leerjaar 3

Chapter 1 — Section 4

Electricity and safety

Chapter 1 — Section 4

Electricity and safety

• The dangers of electricity
  
• Overloading and short circuiting
  
• Earth leakage circuit breakers
  
• Working independently
  

Why is electricity dangerous?

Why is electricity dangerous?

Why is electricity dangerous?

Why is electricity dangerous?

Dangers of electricity

• What is overloading?
  
• What is short-circuiting?
  
• What is the maximum power that can be transfer through a group?
  

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.

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?

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

Earth leakage circuit breakers

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!