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ELEC1111 Online Tutorial

Topic 6: Inductors and RL Circuits

1. The voltage 𝑣𝐿(𝑡) across a 25 mH inductor is given in the following figure. Draw the current waveform across it for 0 ≤ 𝑡 ≤ 2 assuming 𝑖(0) = 0.

2. Find the energy stored in the inductor L and the capacitor C of the following circuit under steady state conditions.

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3. Calculate the equivalent inductance Leq of the following circuits.

4. The switch in the following circuit has been in position A for a long time.

At 𝑡 = 0, the switch moves from position A to B. Calculate:
(a) the current across the inductor 𝑖𝐿(𝑡) for 𝑡 > 0,
(b) the voltage of the inductor after the switch has been moved to position B, and (c) the voltage across the inductor 𝑣𝐿(𝑡) for 𝑡 > 0.

5. Obtain the inductor current for both 𝑡 < 0 and 𝑡 > 0 in the following circuit.

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