Which semiconductor component is bidirectional___________?
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Answer: D. TRIAC
Explanation
A TRIAC is explicitly designed as a bidirectional semiconductor switch for alternating currents. Triggering the gate allows current conduction in either forward or reverse polarities. This dual-direction capability distinguishes TRIACs from unidirectional rectifiers and diodes. TRIAC stands for Triode for Alternating Current, operating as two parallel thyristors in reverse. Diodes and standard SCRs conduct current strictly in a single forward direction. Bidirectional switches simplify AC power control by eliminating the need for parallel reverse diodes.
TRIACs are extensively used in appliance motor controls, heaters, and lighting dimmer switches. Their bidirectional nature allows efficient control over both halves of AC sinusoidal waves. Circuit designers choose TRIACs for cost-effective low-power alternating current switching tasks. A diode is a unidirectional component that blocks current flow in the reverse direction. A BJT is a transistor designed for unidirectional current flow within DC biasing circuits. An SCR is a unidirectional thyristor that conducts current only from anode to cathode.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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