The device through which an electrical current passes in one direction only is a
Correct answer: A. Diode.
- A. Diode.
- B. Buffer.
- C. Resistor.
- D. Resistor-transistor.
Explanation
The correct answer is a diode. Diodes are semiconductor devices that allow current to flow in one direction only, acting as a one-way valve for electric current. This property is utilized in various applications, such as rectifying alternating current (AC) to direct current (DC). The other options do not specifically allow current to pass in only one direction; a buffer isolates circuit stages, a resistor limits current flow, and a 'resistor-transistor' is not a recognized component. Therefore, only the diode fulfills the requirement of unidirectional current flow.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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