Which diode waste the most power?

The diode that typically wastes the most power is the standard silicon diode, particularly when used in applications with high forward current. This is due to its relatively high forward voltage drop, usually around 0.7 volts, which results in greater power dissipation as heat. In contrast, Schottky diodes have lower forward voltage drops and generally waste less power. However, if we consider specific circumstances, power loss can vary based on application, current levels, and type of diode used.