Physics · Year 11

Active learning ideas

Ohm's Law and Simple Circuits

Hands-on circuit work helps students confront misconceptions about current, voltage, and resistance in ways that calculations alone cannot. Building, measuring, and graphing reveal patterns that static diagrams or textbook explanations often obscure.

• ACARA Content Descriptions
• AC9SPU14

• 30–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Simulation Game
• 45 min · Pairs

Circuit Building Labs: Series vs Parallel

Provide battery packs, resistors, wires, and multimeters. In pairs, students build series circuits first, measure total resistance, current, and voltage drops; then rewire to parallel and compare results. Have them calculate expected values beforehand and discuss matches.

Explain how Ohm's Law models the behavior of non-ohmic conductors under varying thermal conditions?

Facilitation Tip

During Circuit Building Labs, have students sketch predicted voltage drops before measuring so they compare theory to real readings.

What to look for

Present students with a circuit diagram containing two resistors in series and a known voltage source. Ask them to calculate the total resistance, the current flowing through the circuit, and the voltage drop across each resistor. Collect their calculations for review.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 02

• Simulation Game
• 50 min · Small Groups

V-I Graphing Stations

Set up stations with variable power supplies and resistors of different values. Small groups plot voltage-current graphs, identify slopes as resistance, and test a filament bulb to observe non-linearity. Groups share graphs in a class gallery walk.

Predict the current through a resistor given the voltage across it and its resistance.

Facilitation Tip

At V-I Graphing Stations, ask students to label axes and units on graph paper before plotting to prevent scaling errors.

What to look for

Provide students with a V-I graph for a component that is not an ohmic conductor. Ask them to: 1. Calculate the resistance at two different points on the graph. 2. Explain why the resistance is changing.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Simulation Game
• 40 min · Pairs

Design Challenge: Target Current

Challenge pairs to design a circuit achieving a specific current using given components. They sketch diagrams, build, test with ammeter, and adjust resistances. Present successful designs to the class with calculations.

Design a simple circuit to achieve a specific current or voltage.

Facilitation Tip

For the Design Challenge, provide a resistor color-code chart and a multimeter tutorial so students can verify their resistor choices before building.

What to look for

Pose the following scenario: 'Imagine you need to design a simple circuit to power an LED that requires 2V and 30mA. You have a 9V battery and a selection of resistors. How would you approach designing this circuit, and what calculations would you perform?' Facilitate a class discussion on their proposed solutions.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 04

• Simulation Game
• 30 min · Individual

Non-Ohmic Heat Test

Individuals or pairs connect a resistor to a variable supply, measure V-I before and after heating with a hairdryer. Graph both and calculate resistance changes. Discuss thermal effects in a whole-class debrief.

Explain how Ohm's Law models the behavior of non-ohmic conductors under varying thermal conditions?

Facilitation Tip

In the Non-Ohmic Heat Test, require students to record filament temperature with an IR thermometer to connect resistance changes to observable data.

What to look for

Present students with a circuit diagram containing two resistors in series and a known voltage source. Ask them to calculate the total resistance, the current flowing through the circuit, and the voltage drop across each resistor. Collect their calculations for review.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

A few notes on teaching this unit

Start with simple circuits to build intuition before parallel branches confuse students. Demonstrate how a multimeter works on the bench so students can troubleshoot their own setups. Use guided inquiry before open exploration; early miswiring helps students understand series versus parallel flow. Research shows students grasp Ohm’s Law better when they measure real quantities rather than simulated ones.

By the end of these activities, students will confidently calculate and measure voltage, current, and resistance in series and parallel circuits. They will also analyze non-ohmic behavior and design functional circuits that meet specific current requirements.

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Watch Out for These Misconceptions

• During Non-Ohmic Heat Test, watch for students who assume the lamp filament follows Ohm’s Law.

  Have students plot V-I data on graph paper, observe the curve, and recalculate resistance at three voltages to see how it rises with temperature.

• During Circuit Building Labs, watch for students who think current changes across resistors in series.

  Ask them to measure current at three points in the series loop and compare values to confirm it stays constant.

• During V-I Graphing Stations, watch for students who think parallel circuits add resistances like series circuits.

  Have them build a simple parallel branch with two identical resistors, measure total current, and calculate total resistance to see it is lower than either resistor.

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Methods used in this brief

• Simulation Game