In the RC Circuit Lab, the time constant of the circuit (not its nominal value)
ID: 1558955 • Letter: I
Question
In the RC Circuit Lab, the time constant of the circuit (not its nominal value) is determined by: (A) direct measurement. (B) calculation from C and V_. (C) calculation from C and R. (D) given by the instructor. Suppose that in CRT lab, you were able to produce a nicely focused spot on the screen that with voltages V_C = 150V and V_B = 280V, Assuming the rest of the circuit is as covered in the class, specify the values of potentials of cathode K, control grid G, anode A_, and anode A_ (Assume also that the battery providing control grid voltage was measured to give V = 4.0V. The oscilloscope is set to measure time-dependent voltage signal (so V vs t, not V_y vs. V_x). The voltage on the horizontal defection plates will be the input signal whose value we are attempting to measure. The voltage on the vertical plates is: A. constant nonzero DC voltage. B. time dependent periodic voltage. C. exponentially decreasing in time voltage. D. there is no voltage b/w vertical plates. Suppose that the value of limiting resistance in lab DC Circuits is increased. This action: A. reduces the value of no-load current. B. increases the value of emf, decreases the value of no-load current. C. increases the value of no-load current. D. decreases the value of emf, leaving no-load current unchanged. The voltage signal produced by a function generator is currently being displayed on an oscilloscope. If you wish to increase the horizontal size of the graph without changing the voltage signal, you should adjust: A. the MTB (time/div) on the oscilloscope.Explanation / Answer
Q1.
In RC circuit lab when the value of R and C is provided, we can calculate the time constant using the direct formula
T = R*C
So, Option a - direct measurement.
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