Generating electrical energy

• Physics
• Middelbare school
• vwo
• Leerjaar 3

§6.5 Electrical Energy

Lesson plan:

1. Freshing up our memories - recap chapter 6 so far
2. Explanation Power of electrical appliances
3. Practice exercises §6.5 
4. Checkpoint §6.5

Testweek: chapter 6 electricity

Learning goals §6.5

• You can explain what the power of an appliance is and how that is related to energy consumption. 
  
  
• You can do calculations with the formula E = P * t 
• You can calculate from energy consumption to energy costs

Meter 2 is a....
and measures...... in ........

Section 1: Generating electricity

Electrical power

Power=​time​​Energy​​

P=​t​​E​​

New physical quantity:

Power

Unit of power:

• Watt (W) (Joule/second)
  
• Kilowatt (KW) (kilojoules/second)

Formula

• P: power (Watt) (W)
  
• E: energy (Joule) (J)
  
• t: time (seconds) (s)
  

The amount of energy something generates or uses per unit of time.

Example: An LED light has a power

of 9 watts (It uses 9 joules per second).

Homework

Section 1, Exercise: 

3, 4, 5, 6, 8