When does an ideal diode conduct current in a circuit?

An ideal diode conducts current when it is forward-biased. In this condition, the anode of the diode is at a higher potential than the cathode, allowing current to flow through the diode easily. The forward-bias condition overcomes the barrier potential of the diode, enabling it to act as a complete electrical conductor.

This property allows diodes to function effectively in circuits for rectification purposes, where they convert alternating current (AC) to direct current (DC) by allowing current to pass in one direction while blocking it in the opposite direction. The concept of forward bias is fundamental in understanding diode operation in various applications, including power supplies and signal processing.

In contrast, options that refer to reverse-bias, no load conditions, or only during power-up do not describe conditions where an ideal diode would conduct current, as they either block current flow or do not apply specifically to the operation of a diode.