Transcript P4.5 Electrical Safety

Bell Work
1. What is the equation for resistance?
2. What happens to the current if the
voltage is doubled?
3. What happens to the current if the
voltage is doubled and the resistance is
doubled?
4. What happens to the current if the
voltage is doubled and the resistance is
halved?
How is a teacher like a
fuse?
P4.5 Electrical Safety
Lesson Objectives
• To explain how
electrical devices are
designed with
protection in mind
What do you already
know about today’s
learning outcomes?
Learning Outcomes
Grade C
• Describe and explain the
functions of a plug
Grade B
• Explain why double insulated
appliances are useful
Grade A
• Describe and explain how
fuses work
Grade A*
• Explain why houses use a
combination of fuses and
circuit breakers
All appliances need
Earthing?
Agree/disagree/why?
Fuses
• Why is this device useful?
• What are the disadvantages?
• What?
• Why?
• When?
P4.5 Electrical Safety
Lesson Objectives
• To explain how
electrical devices are
designed with
protection in mind
What do you already
know about today’s
learning outcomes?
Learning Outcomes
Grade C
• Describe and explain the
functions of a plug
Grade B
• Explain why double insulated
appliances are useful
Grade A
• Describe and explain how
fuses work
Grade A*
• Explain why houses use a
combination of fuses and
circuit breakers