An RL circuit has L = 0.45 H and R = 5.5 Ω.It is connected to a battery with ε = 19 V at time t = 0.Find the energy stored in the inductor when the current in the circuit is 0.40 A.
A) 36 mJ
B) 72 J
C) 180 J
D) 5.4 J
E) 620 J

Question

An RL circuit has L = 0.45 H and R = 5.5 Ω.It is connected to a battery with ε = 19 V at time t = 0.Find the energy stored in the inductor when the current in the circuit is 0.40 A.
A) 36 mJ
B) 72 J
C) 180 J
D) 5.4 J
E) ​620 J

Quizplus · Accepted Answer

The energy stored in an inductor is given by the formula $ E = \frac{1}{2} L I^2 $. Substituting the given values: $ E = \frac{1}{2} \times 0.45 \, \text{H} \times (0.40 \, \text{A})^2 = 0.036 \, \text{J} = 36 \, \text{mJ} $.

An RL Circuit Has L = 0