Lesson 3 — Discussing the test

• Physics
• Middelbare school
• vwo
• Leerjaar 3

Electricity

This lesson

• Planner period 3
  
• Discussing the testweek test
  
• Start paragraph 5.2
  

Planner period 3

Discussing the testweek test

Voltage current and resistance

Physical quantity	Symbol for physical quantity	Unit	Symbol for unit
		Ampere
	U
			Ω

Physical quantity	Symbol for physical quantity	Unit	Symbol for unit	Base units
Current	I	Ampere	A	Coulomb / second (C/s)
Voltage	U	Volt	V	Joule / Coulomb (J/C)
Resistance	R	Ohm	Ω	(Not required)
Specific resistivity	ρ	Ohm meter	Ωm	(not required)

But what are they?

Current, Voltage and resistance are three properties of an electrical circuit.

• Current: The amount of charge flowing by per time.
  

• Voltage: The amount of energy per charge.
  

• Resistance: A measure of how much a material resists the flow of current
  

R=​I​​U​​

Homework

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