Which quantity opposes any change in current?

Which quantity opposes any change in current?

• A. Inductance
• B. Capacitance
• C. Resistance
• D. Voltage

Answer: (A)

Inductance resists changes in current. When current tries to change, an inductor generates a self-induced emf that opposes that change, making it harder for the current to increase or decrease quickly. This opposing voltage is proportional to how fast the current is changing, described by v = L di/dt. In practice, energy is stored in the magnetic field around a coil, and the inductive effect is why current changes are smoothed out in circuits. Capacitance, on the other hand, resists changes in voltage by storing charge, not current. Resistance simply limits current flow without generating a counter-emf, and voltage is the driving potential, not the quantity that inherently opposes changes in current.

Inductance resists changes in current. When current tries to change, an inductor generates a self-induced emf that opposes that change, making it harder for the current to increase or decrease quickly. This opposing voltage is proportional to how fast the current is changing, described by v = L di/dt. In practice, energy is stored in the magnetic field around a coil, and the inductive effect is why current changes are smoothed out in circuits.

Capacitance, on the other hand, resists changes in voltage by storing charge, not current. Resistance simply limits current flow without generating a counter-emf, and voltage is the driving potential, not the quantity that inherently opposes changes in current.