# Lesson Plan: Ohm’s Law Physics

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.