Physics · Year 11

Active learning ideas

Resistance and Resistors

Active learning is essential for understanding resistance because it moves beyond abstract definitions to tangible experiences. By manipulating variables and observing outcomes, students can build a concrete mental model of how resistance works in real circuits.

• National Curriculum Attainment Targets
• GCSE: Physics - Electricity
• GCSE: Physics - Electric Circuits

• 25–45 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Factors Affecting Resistance

Set up stations with different lengths and thicknesses of the same wire material. Students measure the resistance of each wire using an ohmmeter and record their findings, comparing results to identify trends. A station could also include different materials to explore resistivity.

Explain the concept of electrical resistance and its units.

Facilitation Tip

During Stations Rotation, circulate to ensure students are accurately measuring resistance with multimeters and recording their data systematically.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 02

• Inquiry-Based Learning
• 30 min · Pairs

Build a Rheostat

Students construct a simple variable resistor using a pencil lead, crocodile clips, and a power source. They can then use this rheostat to control the brightness of a bulb in a circuit, demonstrating the effect of changing resistance on current.

Analyze how factors like length, cross-sectional area, and material affect resistance.

Facilitation Tip

When students build a rheostat, observe their connections and guide them in adjusting the position of the crocodile clip to demonstrate changing resistance.

• Apply
• Analyze
• Evaluate
• Self-Management
• Social Awareness

Activity 03

• Inquiry-Based Learning
• 25 min · Individual

Resistor Color Code Challenge

Provide students with a set of resistors and the color code chart. They work individually or in pairs to determine the resistance value and tolerance of each resistor, then verify their readings with an ohmmeter.

Compare the properties and uses of fixed and variable resistors.

Facilitation Tip

During the Resistor Color Code Challenge, encourage pairs to quiz each other and check their answers using a multimeter before moving to the next resistor.

• Apply
• Analyze
• Evaluate
• Self-Management
• Social Awareness

A few notes on teaching this unit

Teachers often find that hands-on exploration is key to demystifying resistance. Presenting resistance not as a 'consumer' of current but as an 'opposer' is crucial, supported by activities that show current is conserved. Emphasize that resistance is an intrinsic property influenced by physical characteristics and material composition.

Successful learning looks like students confidently explaining how length, material, and cross-sectional area affect resistance, and accurately using the resistor color code. They will be able to predict how changing these factors will alter current flow in a circuit.

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Watch Out for These Misconceptions

• During the Stations Rotation, watch for students who believe that measuring resistance somehow 'uses up' the wire or the multimeter's battery.

  Redirect students by having them measure the resistance of the same wire multiple times, or measure the resistance of the multimeter itself, to show it's a stable property and the multimeter is just measuring it.

• During the Build a Rheostat activity, students may assume that any wire will work the same way, overlooking the importance of material.

  Prompt students to compare the resistance range they achieve with the pencil lead versus, hypothetically, using a piece of copper wire of similar dimensions; discuss why the pencil lead (graphite) offers variable resistance.

• During the Resistor Color Code Challenge, students might assume all resistors with the same color bands have the same resistance, forgetting tolerance.

  After they determine the nominal resistance, have them use a multimeter to measure the actual resistance and compare it to the calculated value, discussing the meaning of the tolerance band.

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Methods used in this brief

• Stations Rotation
• Inquiry-Based Learning