Quick Answer:The Resistance Board carries three 40 cm resistance wires whose thicknesses are in the ratio 1:2:4, on a 50 cm wooden base with 4 mm sockets, for investigating how the cross-section of a conductor affects its resistance.
Last updated: 18 October 2026
Key Features
Three resistance wires, each 40 cm long.
Wire thicknesses in the ratio 1:2:4.
Built-in terminals with 4 mm sockets.
Two 50 cm connecting leads with 4 mm banana plugs included.
Sturdy 50 cm wooden base.
Technical Specifications
Specification
Value
Base
Wooden, 50 cm long
Resistance wires
3, each 40 cm long
Thickness ratio
1:2:4
Terminals
4 mm sockets
Leads included
2 x 50 cm connecting wires with 4 mm banana plugs
How It Is Used
Each wire is connected in turn into a circuit with a meter and its resistance is found. Because all three wires are the same length but differ in thickness, the results show resistance falling as the cross-section grows, in line with R = ρL/A.
Frequently Asked Questions
What is supplied with the Resistance Board?
The board with three 40 cm resistance wires and 4 mm socket terminals, plus two 50 cm connecting wires fitted with 4 mm banana plugs.
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