The PTC resistor

Principle

In connection with Ohm's Law, the students have already learned that pure metallic conductors have a resistance which increases with increasing temperature.
PTC resistors (Positive Temperature Coefficient) behave the same way in a certain temperature range. Both of these experiments are used to prove this.
The first experiment does not just serve as an introduction to this topic. It is also useful for demonstrating the terms self-heating (in the first experiment) and external heating (in the second experiment). The second experiment is useful in confirming these concepts.

Benefits

• No additional cable connections between the building blocks needed - clear arragned and quick setup
• Contact saftey due to puzzle blocks system
• Corrosion-free gold plated contacts
• Doubled earning sucess: Electric circuit diagram on top, real components can be seen unterside

Tasks

How does a PTC resistor react to an increase in temperature?

Determine the resistance values for a PTC resistor with various currents and at various temperatures.