What is the basic unit of inductance?

What is the basic unit of inductance?

• A. The Farad
• B. The Henry
• C. The Volt
• D. The Ohm

Answer: (B)

Inductance is measured in henries. The henry is defined by the relationship V = L di/dt, where voltage across the inductor equals the inductance times the rate of change of current. This means a circuit with 1 henry of inductance produces 1 volt when the current is changing at 1 ampere per second. In other words, L = V / (di/dt), so 1 H corresponds to V = 1 × (di/dt) with di/dt = 1 A/s giving V = 1 V. The other units shown—farad (capacitance), volt (voltage), and ohm (resistance)—do not measure inductance.

Inductance is measured in henries. The henry is defined by the relationship V = L di/dt, where voltage across the inductor equals the inductance times the rate of change of current. This means a circuit with 1 henry of inductance produces 1 volt when the current is changing at 1 ampere per second. In other words, L = V / (di/dt), so 1 H corresponds to V = 1 × (di/dt) with di/dt = 1 A/s giving V = 1 V. The other units shown—farad (capacitance), volt (voltage), and ohm (resistance)—do not measure inductance.