How do you calculate the impedance of the primary circuit?

Thread starter Andrei0408
Start date May 13, 2021
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Circuit Impedance

In summary, impedance is the measure of opposition to the flow of alternating current (AC) in a circuit, represented by the symbol Z and measured in ohms (Ω). It is important to calculate the impedance of the primary circuit in order to understand how the circuit will behave with an AC current and for designing and troubleshooting electronic circuits. The impedance is affected by resistance, inductance, and capacitance, and can be calculated using the formula Z = √(R^2 + (Xl - Xc)^2). The impedance of a primary circuit can change depending on frequency and changes in resistance, inductance, and capacitance.

May 13, 2021

Andrei0408

Homework Statement: I have an assignment that I need to do regarding magnetically coupled coils, but I'm stuck at a point. If we know the following: f=5000Hz, the distance between coils, x=20mm, the voltages U1=3.18V U2=336mV, the current I1=100.6mA, N1=250, N2=1000, how can I calculate the impedance of the primary circuit, Z1? I've looked it up online but I can't find any formulas with these particular given data. Any ideas?

Relevant Equations: M = U2/(ω*I1)

I'm not sure if it helps for what I'm looking, but I've calculated the mutual inductance, M, using the equation: M=U2/(ω*I1) = 106.3μH. I don't need the numerical value in particular, I just want to find a way to deduce the formula in order to calculate Z1. Thank you!

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May 14, 2021

tech99

Science Advisor

Gold Member

Do we know what the secondary is connected to?

1. What is impedance?

Impedance is a measure of the total opposition to current flow in an electrical circuit. It is made up of both resistance and reactance, and is measured in ohms.

2. How is impedance calculated?

Impedance is calculated by dividing the voltage by the current in a circuit. This can be done using Ohm's Law: Z = V/I, where Z is the impedance, V is the voltage, and I is the current.

3. What is the primary circuit?

The primary circuit is the part of an electrical system that is connected directly to the power source. It typically includes the power source, switches, and transformers.

4. How do you calculate the impedance of the primary circuit?

The impedance of the primary circuit can be calculated by measuring the voltage and current in the circuit and using Ohm's Law to find the impedance. Alternatively, if the circuit is more complex, it may require using more advanced equations and techniques.

5. Why is calculating impedance important?

Calculating impedance is important because it allows us to understand and analyze the behavior of electrical circuits. It helps us determine the amount of current that will flow through a circuit and how much power will be dissipated. It is also essential for designing and troubleshooting electrical systems.