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.