Lesson 4 — Current, voltage and ressistance

• Physics
• Middelbare school
• vwo
• Leerjaar 3

Electricity — 5.2 Resistance

This lesson

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

Changes to the planner

Current, voltage, Resistance

Water tank comparison.

Current, voltage, Resistance

R=​I​​U​​

I=​R​​U​​

Worksheet

Specific resistivity

R=​A​​ρ⋅l​​

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)

Worksheet

Homework

Worksheet:

< Part 2 Exercise 1 to 4 + 6 & 7

> Part 2 Exercise 1, 2, 5, 8 & 9