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What is the effect of frequency on XL and XC?
Note: Xl is a linear function; it increases as frequency or inductor value increases. Note: Xc is inversely proportional to frequency and capacitance. If either frequency or capacitance increases, Xc decreases.
What is the relationship between capacitive reactance and frequency?
Capacitive reactance of a capacitor decreases as the frequency across its plates increases. Therefore, capacitive reactance is inversely proportional to frequency. Capacitive reactance opposes current flow but the electrostatic charge on the plates (its AC capacitance value) remains constant.
What happens if XL XC?
If XL =Xc, then tan ∅ = 0 and the current is in phase with the voltage, and the circuit is known as a resonant circuit.
How to find C and L from XC and XL?
Similarly for XC = 1 / (2 x pi x f x C) first take the reciprocal of both sides: 1 / XC = (2 x pi x f x C). Now divide both sides of the equation by (2 x pi x f) to leave C = 1 / ( XC x 2 x pi x f).
Why is a LC tank circuit called a tank circuit?
It’s called a tank circuit because as time goes on, the energy in the circuit tanks, or dwindles till it’s nonexistent. It’s basically a circuit that starts out very high energy but that loses its energy as time goes on. How the LC tank circuit works is that an inductor and capacitors are in series with each other.
Why does a LC tank need a DC power supply?
So in order for this circuit to work, it first must be charged by a DC power supply. The power supply has to be DC because only DC can charge up a capacitor. At high-frequency (AC), the capacitor has a reactance (or resistance) according to the formula, X C = 1/2πfc.
What do you need for a LC tank?
The only 2 components that we need are a 1nF ceramic capacitor and a 270mH inductor. the capacitor should be a ceramic capacitor, not an electrolytic, because charging needs to occur on both sides of the capacitor. With an electrolytic capacitor, the leads are polarized, so it can only be charged on one side.