What is the L/R constant for this series circuit?

In summary, the circuit described consists of a supply, two resistors (4K and 1K), and an inductor (1m) connected to ground. The question at hand is regarding the frequency-magnitude response of the circuit, specifically at point X, which is between the inductor, 1K resistor, and ground. The goal is to plot this response on a bode plot, with the magnitude being negative or zero due to the voltage being a fraction of the original.
  • #1
thomas49th
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Homework Statement


Consider the series circuit with

supply -- resistor (4K) -- inductor (1m) -- resistor (1K) -- groud


Homework Equations


I just don't know. According to the answer sheet it's 1us.

The Attempt at a Solution



Reverse engineering from this implies it's only the inductor and resistor connect to ground (1K) that influence the L/R... why not the 4K!?


Thanks
Thomas
 
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  • #2
That can't be right, because the "R" in L/R is total resistance.
 
  • #3
Basically using that circuit I need to plot the freq-magnitude response on a bode plot... that is the mag response between the inductor, 1k and ground. Let's call this point X. The magnitude response is X/supply. On a bode plot is should be negative (or 0) as the voltage across the 2 components is a fraction of the original and on a bode plot, numbers <1 are -ve.
 

FAQ: What is the L/R constant for this series circuit?

What is the L/R constant of this circuit?

The L/R constant of a circuit refers to the time constant, which is the product of the inductance (L) and resistance (R) in the circuit. It represents the time it takes for the current in the circuit to reach 63.2% of its maximum value when a DC voltage is applied.

How is the L/R constant calculated?

The L/R constant can be calculated by dividing the inductance (L) by the resistance (R) in the circuit. The resulting value is measured in seconds (s).

What is the significance of the L/R constant in a circuit?

The L/R constant is important because it determines the rate at which the current in the circuit reaches its maximum value. It also affects the behavior of the circuit when a voltage is applied, such as the time it takes for the current to decay to zero when the voltage is removed.

How does the L/R constant affect the behavior of an inductor in a circuit?

The L/R constant affects the behavior of an inductor in a circuit by determining the rate at which the current in the inductor changes. A larger L/R constant means the current changes more slowly, while a smaller L/R constant means the current changes more quickly. This can affect the overall performance and stability of the circuit.

Can the L/R constant be changed in a circuit?

Yes, the L/R constant can be changed by altering the inductance or resistance in the circuit. For example, increasing the inductance or decreasing the resistance will result in a larger L/R constant, while decreasing the inductance or increasing the resistance will result in a smaller L/R constant.

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