Principle

The students know that self-induced voltage is generated in a
coil in a direct current circuit when the circuit is closed or
opened. They also know which direction the sel-finduced current
has.
Based on this knowledge, they can probably predict what happens
when alternating current flows through a coil. The first experiment
demonstrates that the additional resistance, which coils possess in
an alternating current circuit as opposed to their resistance in a
direct current circuit, is dependent on frequency. Of course, there
is no alternating voltage source used to provide a variable
frequency in this experiment, but a similar effect can be achieved
by switching the switch for direct voltage on and off at different
rates.

The second experiment is used to provide a semi-quantitative
analysis of the dependency of inductive resistance on the number
of turns and the coil core.

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 coil act in an alternating current circuit?

Prove that a coil in an alternating current circuit possesses a
resistance in addition to the ohmic resistance from its wound wire
and investigate the factors responsible for this additional
resistance.