- #1
Monsu
- 38
- 1
hi, i want to ask, what is the impedance across a resisitor? isn't it just the value of the resistor? say i have a resistor of 50ohms, then its impedance is 50ohms, right??
thanks!
thanks!
Impedance is the measure of the opposition to the flow of an alternating current (AC) in an electric circuit. It is similar to resistance, but it takes into account both the magnitude and phase of the current and voltage.
Resistance only takes into account the magnitude of the current and voltage, while impedance also considers the phase relationship between them. Impedance is a complex quantity, meaning it has both real (resistive) and imaginary (reactive) components.
The unit of impedance is ohms (Ω), which is the same unit for resistance. However, impedance is a complex quantity, so it is often represented using phasors or complex numbers.
The formula for calculating impedance across a resistor is Z = R, where Z is the impedance, R is the resistance of the resistor, and the unit for both is ohms (Ω). This is because in a purely resistive circuit, the magnitude of the current and voltage are in phase with each other, so the impedance is equal to the resistance.
Impedance is important in AC circuits because it affects the flow of current and the distribution of voltage in the circuit. It also determines the amount of power that can be transferred through the circuit. In addition, impedance helps in analyzing and designing AC circuits, as it takes into account the effects of capacitance and inductance.