A diode is defined as:

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Multiple Choice

A diode is defined as:

Explanation:
A diode conducts current in only one direction. This comes from its PN junction: when the anode is more positive than the cathode by about 0.6–0.7 volts (for silicon), current flows easily, but in the opposite direction the junction blocks current until breakdown. That's why it's described as an electrical device that restricts current flow to one direction. Other options describe different components: storing energy is a capacitor, a source of alternating current is an AC generator, and a resistor simply resists current without enforcing a one-way flow.

A diode conducts current in only one direction. This comes from its PN junction: when the anode is more positive than the cathode by about 0.6–0.7 volts (for silicon), current flows easily, but in the opposite direction the junction blocks current until breakdown. That's why it's described as an electrical device that restricts current flow to one direction. Other options describe different components: storing energy is a capacitor, a source of alternating current is an AC generator, and a resistor simply resists current without enforcing a one-way flow.

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