Quick Answer: The Internal Resistance Board has six low-value 2.5 W resistors for measuring terminal voltage and current, so the internal resistance and maximum current of AA and D cells can be compared.
Last updated: October 2026
Key Features
Six low-value 2.5 W resistors
Supplied with batteries
Ammeter connects between point X and the top of the resistor
Voltmeter connects across the resistor
Compares AA and D cells for internal resistance and maximum current
About This Product
With the ammeter between point X and the top of a resistor and the voltmeter across it, the voltage is measured across each of the six resistors. Students should see a pattern: smaller resistors result in a smaller terminal voltage and a larger circuit current. AA and D cells can be compared for internal resistance and maximum current.
Frequently Asked Questions
Q1. What pattern should the results show? Smaller resistors result in a smaller terminal voltage and larger circuit currents.
Q2. Which cells can be compared? AA and D cells, for internal resistance and maximum current.
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