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Amanda [17]
3 years ago
11

An important concept to aid understanding of electromagnetics is electrical length. Electrical _________ is a unitless measure t

hat refers to the length of a wire or device at a certain ___________ . It is defined as the ration of the physical ___________ of the device to the_____________ of the signal frequency.
Engineering
1 answer:
kondor19780726 [428]3 years ago
3 0

Answer: Electrical length is a unitless measure that refers to the length of a wire or device at a certain frquency. It is defined as the ratio of the physical length of the device to the wavelength of the signal frequency.

Explanation:

In nature, the maximum speed achievable for any interaction or perturbation along a medium (like a wire) can't be higher than the speed of light, otherwise it would be violating Einstein's Relativity Theory.

So, in a given circuit, the voltage and current aren't set up instantaneously, and a finite time exists since a battery is connected to a circuit till a stable current  traverses a load resistor connected to it.

Now, the electrical length, defines how important in is this delay, in the calculation of the voltage through the resistor, for instance.

We can write the electrical length (L.E.) as follows:

L.E. = L / (v/f) = L / λ

As we can see, the effect depends not only on the circuit dimensions, but the frequency of the signal as well.

If L.E. is much smaller than λ, this means that we can neglect the effects of the delay, and we can use the circuit theory, namely KVL, KCL and Ohm's law to analyze the circuit, assuming that the current establishes instantaneously.

Otherwise, the current and voltage concepts are not valid anymore, as we need to think in terms of propagation of electromagnetic waves, like in transmission lines and antennas.

Roughly, if L.E. ≤ 20 λ, we say that we are still in the realm of the circuit theory.

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Answer:

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m_2=11.946

So, the total mass of the aire entered is

m_v=m_2-m_1\\m_v=11.946-2.362\\m_v=9.584kg

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u_1=210.49kJ/kg

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At the end we make a Energy balance, so

U_{cv}(t)-U_{cv}(t)=Q_{cv}-W{cv}+\sum_i m_ih_i - \sum_e m_eh_e

No work done there is here, so clearing the equation for Q

Q_{cv} = m_2u_2-m_1u_1-h_1(m_v)

Q_{cv} = (11.946*250.02)-(2.362*210.49)-(295.17*9.584)

Q_{cv}=-339.347kJ

The sign indicates that the tank transferred heat<em> to</em> the surroundings.

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Read 2 more answers
What is the value of the magicPowers variable after executing the following code snippet? String magicPowers = ""; int experienc
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Answer:

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Explanation:

I will explain the code line by line.

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Nested if statement are used and lets see which of those statements execute.

The first if statement checks if the value of experienceLevel is greater than 10. This statement evaluates to false because the value of experienceLevel is set to 9. Then the program control moves to the next if statement.

The second if statement checks if the value of experienceLevel is greater than 8. This if condition evaluates to true because the value of experienceLevel  is 9. So this if statement is executed which contains the statement magicPowers = magicPowers + "Shining lantern "; . This means magicPowers stores the string Shining lantern.

The third if statement checks if the value of experienceLevel  is greater than 2. As the value of experienceLevel  is 9 so this condition also evaluates to true which means the statement magicPowers = magicPowers + "Magic beans "; is executed. This statement means magicPowers stores the string Magic Beans

You can use a print statement to display the output on the screen as:

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The program along with the output is attached as a screenshot.

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