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Now consider a series RL circuit like that from Figure 1 of the introduction to

ID: 2100067 • Letter: N

Question

Now consider a series RL circuit like that from Figure 1 of the introduction to this lab. a) What is the RL time constant for a series RL circuit with a 500 ? resistor and a 10 mH inductor? b) Assume that you are driving the RL circuit with a square wave voltage source. You would like five time constants to elapse during the portion of the square wave (half of the period) when the current is building up. What frequency do you need to set the function generator at to obtain this condition? Now consider a series RL circuit like that from Figure 1 of the introduction to this lab. a) What is the RL time constant for a series RL circuit with a 500 ? resistor and a 10 mH inductor? b) Assume that you are driving the RL circuit with a square wave voltage source. You would like five time constants to elapse during the portion of the square wave (half of the period) when the current is building up. What frequency do you need to set the function generator at to obtain this condition?

Explanation / Answer

a)time constant=L/R=20 micro seconds

b)time period=5*20=100micro sec. so f=1/time period=10kHz

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