What is electrical impedance?
Q: What is electrical impedance?
A: Electrical impedance is the amount of opposition that a circuit presents to current or voltage change.
Q: How can electrical impedance be written?
A: Electrical impedance can be written with the resistance "R" (real part) and the reactance "X" (imaginary part), as well as with a magnitude, phase, size, and angle.
Q: What is the difference between resistance and impedance?
A: The key difference between resistance and impedance is the word "change"; in other words, the rate of change affects the impedance. Resistance resists any current going through it while an inductor resists changes to the current and a capacitor resists changes to the voltage.
Q: What are some formulas associated with resistance and impedance?
A: For resistance, V=R*I where V is voltage, R is resistance, and I is current; for inductors Z=j2πfL; for capacitors Z=1/j2πfC; where Z represents impedance, j represents imaginary number -1 , π represents constant pi, f represents frequency, L represents inductance, C represents capacitance.
Q: What are some physical explanations for resistance vs. impedance?
A: Resistance is caused by electrons colliding with atoms inside resistors while an inductor's impedance comes from creating an electric field and a capacitor's comes from creating a magnetic field. Additionally, resistors dissipate energy while inductors and capacitors store energy which can then be returned to source when it goes down.
Q: How do you calculate reflection coefficient?
A: Reflection coefficient can be calculated using Γ=(ZL-ZS)/(ZL+ZS) where Γ (capital gamma) stands for reflection coefficient; ZS stands for source's impedence; ZL stands for load's impedence
