Now that the students have become familiar with the rectifying
quality of diodes, this experiment should demonstrate the
functioning of the bridge circuit normally used in practice. They
should see that the current flows through the load resistor in the
same direction in each half period of the alternating current when
4 diodes in a bridge rectifier are used.
Since oscilloscopes and alternating voltage generators with an
extremely low frequency are generally not used in student
experiments, the behaviour of the bridge rectifier in an
alternating current circuit is simulated by reversing the polarity
of a direct current power source to determine the direction of the
You should encourage the students to predict the behaviour of the
circuit after reversing polarity of the power source.
Aside from the correct answer, here are some other predictions they
might come up with:
- No current will flow after reversing polarity because the
diodes only let the current flow in one direction.
- The current will flow in the opposite direction after reversing
polarity of the voltage.
- 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
How can both half periods of alternating current be used to
create direct current?
Investigate on which path and in which direction the current
flows through the bridge rectifier with various polarity scenarios
for the voltage.