A diode is used to:

A diode is used to:

• A. Increase current
• B. Control the direction of electron flow
• C. Store charge
• D. Smooth voltage

Answer: (B)

A diode’s main job is to let current flow in only one direction. When the anode is more positive than the cathode (forward bias), charges can move across the junction and current passes. If the polarity is reversed (reverse bias), the diode blocks current, preventing flow in that direction. This unidirectional behavior is why a diode is used to control the direction of electron flow, and it’s essential in applications like rectifiers that convert AC to DC or protecting circuits from reverse polarity. The other options don’t fit because a diode doesn’t increase current by itself, nor does it store charge or smoothly voltage—functions that belong to capacitors and filtering/regulating components.

A diode’s main job is to let current flow in only one direction. When the anode is more positive than the cathode (forward bias), charges can move across the junction and current passes. If the polarity is reversed (reverse bias), the diode blocks current, preventing flow in that direction. This unidirectional behavior is why a diode is used to control the direction of electron flow, and it’s essential in applications like rectifiers that convert AC to DC or protecting circuits from reverse polarity. The other options don’t fit because a diode doesn’t increase current by itself, nor does it store charge or smoothly voltage—functions that belong to capacitors and filtering/regulating components.