Lesson 4 — Current, voltage and ressistance

Electricity — 5.2 Resistance
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Electricity — 5.2 Resistance

Slide 1 - Tekstslide

This lesson
  • Changes to the planner
  • Current, voltage & Resistance — Water tank comparison
  • Worksheet Resistance
  • Specific resistivity

Slide 2 - Tekstslide

Changes to the planner

Slide 3 - Tekstslide

Slide 4 - Tekstslide

Current, voltage, Resistance

Water tank comparison.


Slide 5 - Tekstslide

Current, voltage, Resistance

R=IU
I=RU

Slide 6 - Tekstslide

Worksheet

Slide 7 - Tekstslide

Specific resistivity
R=Aρl
Every material has a specific measure of how much it resists the flow of current. 

This property is called the
Specific resistivity of a material.

The formula on the right shows what the resistance of a piece of wire becomes.
  • R: Resistance  — Ohm (Ω)
  • ρ: the resistivity — Ohm-meter (Ωm)
  • l: the length of the wire — meters (m)
  • A: the area of the cross section of the wire — (m2)

Slide 8 - Tekstslide

Worksheet

Slide 9 - Tekstslide

Homework
Worksheet:
< Part 2 Exercise 1 to 4 + 6 & 7
> Part 2 Exercise 1, 2, 5, 8 & 9

Slide 10 - Tekstslide