An LR circuit is connected to a 4V DC power source. The resistance is 5ohms. A)

Question

An LR circuit is connected to a 4V DC power source. The resistance is 5ohms. A) what is the max current in the circuit? B) when the power is shut off, the current drops exponentially. To measure the time constant, you should measure the time until the current drops to what value? C) If you measure this time as 0.1s, what is the value of the inductor? An LR circuit is connected to a 4V DC power source. The resistance is 5ohms. A) what is the max current in the circuit? B) when the power is shut off, the current drops exponentially. To measure the time constant, you should measure the time until the current drops to what value? C) If you measure this time as 0.1s, what is the value of the inductor?

Explanation / Answer

a. maximum current = 4/5=0.8 A

b. 36.78%

c. time constant= L/R

so, 0.1= L/5

so, L=0.5 H

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