Lesson Plan: Ohm’s Law Physics

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This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to use the formula 𝑉 = 𝐼𝑅 (Ohm’s law) to work out the values of the potential difference, current, and resistance in simple circuits.

Objectives

Students will be able to

recall that ohms are the unit of electrical resistance,
use in all permutations,
state how the current through an ohmic conductor varies with potential difference across it,
state how the current through a filament bulb varies with potential difference across it,
state how the current through a diode varies with potential difference across it,
identify an ohmic conductor from a graph of its current and potential difference characteristics,
state how the resistance of an LDR varies with light incident upon it,
state how the resistance of a thermistor varies with temperature.

Prerequisites

Students should already be familiar with

what electric charge is,
what electric current is,
the units of charge and current,
the circuit symbols for a cell, a battery, a resistor, a bulb, a diode, an LED, an LDR, a thermistor, and a variable resistor.

Exclusions

Students will not cover

parallel circuits,
any kind of non-direct current,
Kirchhoff’s laws.