Which of the following electrical devices is NOT used for controlling current and voltage inan alternating current (AC) circuit?
Correct answer: D. Transistor
- A. Resistor
- B. Inductor
- C. Capacitor
- D. Transistor
Explanation
The correct answer is Transistor. Transistors are primarily used for amplification and switching purposes rather than directly controlling current and voltage in AC circuits. On the other hand, resistors, inductors, and capacitors are commonly used components in AC circuits that can influence the current and voltage. Resistors control the flow of current, inductors affect current phase and amplitude, and capacitors filter signals and control voltage levels.
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About AC Through Resistor, Capacitor and Inductor
Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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