The ring launcher demonstrates Lenz’s law and the effects of electromagnetically induced currents. An iron core is placed in a solenoid, with a ring positioned over the coil. When the launch button is pressed, the coil is energized, generating a strong magnetic induction along its axis. This induces an opposite current in the ring, causing repulsion and launching the aluminium ring into the air. No effect is observed with a slit aluminium or acrylic ring.
The transformer principle is demonstrated using a coil with a low-voltage lamp, which briefly lights up. Overheating is prevented by an automatic one-shot timing feature.
A secondary coil enables step-up and step-down transformer action, with primary and secondary voltages displayed. Insulation on all current-carrying components ensures safety and prevents accidental contact.