Readings for two conductors: A resistor: I = 0.1, 0.2, 0.3, 0.4 A with V = 0.8, 1.6, 2.4, 3.2 V…

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Readings for two conductors:

A resistor: $I = 0.1, 0.2, 0.3, 0.4\ \text{A}$ with $V = 0.8, 1.6, 2.4, 3.2\ \text{V}$ .
A bulb: $I = 0.1, 0.2, 0.3\ \text{A}$ with $V = 1.2, 3.3, 6.6\ \text{V}$ .

Find $\dfrac{V}{I}$ for each reading. Which one obeys Ohm's law?

Need a reminder? The key ideaShow

Ohm's law: at a steady temperature, $V = IR$ . So $I = \dfrac{V}{R}$ and $R = \dfrac{V}{I}$ , with $R$ in ohms ( $1\ \Omega = 1\ \text{V/A}$ ). The V-I graph of such a conductor is a straight line through the origin; its slope is $R$ .

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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