Lesson 2 — Resistance

• Physics
• Middelbare school
• vwo
• Leerjaar 3

Chapter 5 - Circuits

This lesson

• Intro exercise
  
• Discussing the homework
  
• Paragraph 5.2 — Ohms law
  

Physical quantity	Symbol	Unit (in words)	Symbol for unit
Current
time
Temperature
Charge
Voltage
speed

Physical quantity	Symbol	Unit (in words)	Symbol for unit
Current	I	Ampere	A
time	t	seconds	s
Temperature	T	degree celsius	ºC
Charge	Q	Coulombs	C
Voltage	U	volts	v
speed	v	meters per second	m/s
Volume	V	cubic meters	m 3

Charge

Current

Voltage

Charge

Current

Voltage

A fundamental property of matter.

Neutral, positive, negative

Loosing and gaining electrons.

Expressed in Coulombs

1 Coulomb = 6.2 • 10¹⁸ electrons

The amount of charge passing through a given point in a circuit per second.

I=​t​​Q​​

Expressed in Amperes

1 ampere = 

1 coulomb/ second

A difference in electrical potential energy between two points in a circuit.

Expressed in Volts

Charge

Current

Voltage

A fundamental property of matter

Neutral, positive, negative

Loosing and gaining electrons

Expressed in Coulombs

1 Coulomb = 6.2 • 10¹⁸ electrons

The amount of charge passing through a given point in a circuit per second

I=​t​​Q​​

Expressed in Amperes

1 ampere = 

1 coulomb/ second

A difference in electrical potential energy between two points in a circuit

Expressed in Volts

Discussing the homework

Paragraph 5.1

Exercise 10 and 11

Paragraph 5.2

Resistance

Voltage — The difference in electrical potential energy between two points

Current —  The amount of coulombs flowing through a point per second

Resistance — A measure of how much something resists the flow of current

R=​I​​U​​

Homework

Paragraph 5.2

Exercise 1, 2, 3 4