Lesson 3

TTO 3 — Physics

Chapter 1. Electricity

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TTO 3 — Physics

Chapter 1. Electricity

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TTO 3 — Physics

Chapter 1. Electricity

This lesson

Recap
Practice exercise
Discussing the homework
Start section 2

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Recap

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Electrical power

P o w e r = \frac{​ E n e r g y ​ ​}{​ t i m e ​}

P = \frac{​ E ​ ​}{​ t ​}

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).

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Discussing the homework

Section 1.

Exercise 3, 4, 5, 6 & 8

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Section 2

Transporting electrical energy

Link

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Homework

Section 2

Read section 2 - The electricity grid

Do section 2 - Exercise 1 and 2

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Lesson 3

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