Lesson 4 — Current, voltage and ressistance

Electricity — 5.2 Resistance

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This lesson contains 10 slides, with text slides.

Lesson duration is: 45 min

Items in this lesson

Electricity — 5.2 Resistance

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This lesson

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

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Changes to the planner

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Current, voltage, Resistance

Water tank comparison.

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Current, voltage, Resistance

R = \frac{​ U ​ ​}{​ I ​}

I = \frac{​ U ​ ​}{​ R ​}

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Worksheet

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Specific resistivity

R = \frac{​ ρ \cdot l ​ ​}{​ A ​}

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)

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Worksheet

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Homework

Worksheet:

< Part 2 Exercise 1 to 4 + 6 & 7

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

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Lesson 4 — Current, voltage and ressistance

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