Energy stored in an inductor
Electromagnetic induction · Physics
DC circuit
Interactive 3DElectrons drift around the loop — raise the voltage and watch the current obey Ohm's law.
Controls
Drag the sliders or type a value — the simulation updates live.
V
1V12V
Study notes
Calculate the energy stored in an inductor with inductance L = 2 H (henries) when the current through it is I = 3 A (amperes). Step 1: Write the energy formula: E = 0.5 × L × I². Step 2: Substitute the given values: E = 0.5 × 2 H × (3 A)². Step 3: Square the current: (3 A)² = 9 A². Step 4: Multiply: 0.5 × 2 = 1, then 1 × 9 = 9. Step 5: The energy stored is E = 9 joules. So, the inductor holds 9 J of magnetic energy.