The inductive reactance of a coil is given by
Correct answer: A. 2 pi f L
- A. 2 pi f L
- B. 1 divided by 2 pi f L
- C. L divided by 2 pi f
- D. 2 pi f divided by L
Explanation
Reactance rises in proportion to frequency, so a coil that passes direct current almost freely offers a large opposition at high frequency. That is why an inductor is called a choke and is used to smooth or to block radio frequency signals. It has units of ohms but dissipates no power, since the current and voltage are 90 degrees out of phase.
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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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