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The correct answer is Transistor. A transistor is a fundamental electronic device that can function both as a switch and an amplifier, making it essential in modern electronics, computers, and communication systems.
As an amplifier, a transistor increases the strength of a weak electrical signal. When a small current or voltage is applied to its input (base), it controls a larger current flowing from the collector to the emitter, effectively amplifying the signal. This property makes transistors crucial in devices like radios, televisions, and audio equipment.
As a switch, a transistor can turn current on or off in a circuit. By applying a voltage to the base, the transistor allows current to flow (switch ON) or stops it (switch OFF), functioning similarly to a mechanical switch but much faster and more reliable. This ability is the backbone of digital circuits, microprocessors, and logic gates in computers.
It is important to note the difference from other devices:
Diode – Allows current to flow in one direction only; cannot amplify.
Resistor – Limits current; does not act as switch or amplifier.
Transformer – Changes voltage levels in AC circuits; does not amplify or switch signals.
Transistors are made from semiconductor materials like silicon and germanium, and come in types such as BJT (Bipolar Junction Transistor) and FET (Field-Effect Transistor). The invention of the transistor revolutionized electronics, replacing bulky vacuum tubes and making modern electronic devices smaller, faster, and more efficient.
Transistor = device used as switch and amplifier.
Amplifies weak signals in audio, radio, and communication devices.
Acts as ON/OFF switch in digital electronics and computers.
Made of semiconductor materials like silicon or germanium.
Replaced vacuum tubes, enabling modern electronics.
👉 Final Answer: The electronic device used as a switch or amplifier is Transistor.
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