The resistance of wires - dependence on length and cross-secion with Cobra SMARTsense

Principle

The resistance R of a metal wire is on the one hand proportional to its length L, but also inversely proportional to its cross-sectional area A: R ∼ L/A. This relationship can be established by two separate series of experiments.

Benefits

• Particularly comprehensible and didactically prepared description of experiments (reference to everyday life, etc.) incl. protocol questions.
• Teach in a future-oriented way: Integration into digital science lessons with tablets or smartphones.
• Increased motivation among students through use of the intuitive measureAPP.
• Increased media literacy.
• No additional cable connections between the modules necessary - clearer and faster set-up.
• contact safety due to puzzle-like interlocking building blocks.
• Hard gold-plated, corrosion-resistant contacts
• Double learning success: electrical circuit diagram visible on the upper side and real components on the lower side

Tasks

Investigate how the resistance value R of a wire is related to its length L and cross-sectional area A.

Learning Objectives

Students should identify the relationships between the resistance of a wire R and its length L and cross-sectional area A based on the measured values they obtain: R ∼ L/A.