0
Still curious? Ask our experts.
Chat with our AI personalities
Blake
Vivi
ProfessorResistance is the opposition to the flow of electric current in a circuit, measured in ohms. Impedance, on the other hand, refers to the total opposition to the flow of alternating current, which includes both resistance and reactance (due to inductance or capacitance). In simple terms, impedance takes into account both resistance and the effect of frequency on a circuit.
In AC circuits, "impedance" generalizes "resistance" by Anon User is a sensible statement giving the angle they are trying to get at, but slightly misleading in my opinion, i would personally say people use Resistance to generalise Impedance.
I would like to clarify further the differences for you, in a more simplistic way, this helped me understand fundamental principles early.
- Resistance is the opposition of electrical current flow.
- Resistance occurs in AC & DCcircuits.
- In addition to Resistance, AC circuits also exhibit Reactance.
- Reactance is also the opposition to electrical current flow.
- By its very nature a DC circuit will not exhibit any form of Reactance, therefore opposition to current flow will always be measured in Resistance.
- Reactance exists in two forms, Capacitive & Inductive.
- the combination of Reactance & Resistance is called Impedance
- Impedance can therefore be thought of as the opposition of electrical current flow in a ACcircuit.
- Due to the nature of AC circuits Reactance is always present (even if only in infinitesimal amounts)
- Any measurement of the opposition of current flow in an AC circuit will always be measured in Impedance.
- Impedance & Resistance are both measured in Ohms, and are interchangeable in many electrical formulas in practice i.e, Ohms Law.
- As a simplistic general view, Impedance can be thought of as Resistance in an AC circuit.
Add your answer:
Earn +20 pts
What is the relationship between phase angle and impedance in an electrical circuit?
In an electrical circuit, the phase angle represents the time delay between the voltage and current waveforms. The impedance of a circuit is the total opposition to the flow of current. The relationship between phase angle and impedance is that the phase angle is determined by the ratio of the reactance to the resistance in the circuit, which affects the overall impedance.
The opposition of current is called?
"Opposition to current" can refer to resistance, reactance, or impedance.
What is the relationship between impedance and phase in electrical circuits?
In electrical circuits, impedance and phase are related because impedance affects the phase angle of a circuit. Impedance is the total opposition to the flow of current in a circuit, which includes both resistance and reactance. The phase angle represents the time delay between the voltage and current waveforms in a circuit. In general, the higher the impedance, the greater the phase shift in the circuit. This relationship is important in understanding how components in a circuit interact and affect the overall performance of the system.
Is impedance a vector or scalar quantity?
Impedance is a vector quantity because it has both a magnitude and a phase angle associated with it. The magnitude represents the resistance and reactance components, while the phase angle accounts for the relationship between the current and voltage in an AC circuit.
What is the equivalent impedance of a resistor and capacitor in parallel?
The equivalent impedance of a resistor and capacitor in parallel is calculated using the formula Z 1 / (1/R 1/Xc), where Z is the total impedance, R is the resistance of the resistor, and Xc is the reactance of the capacitor. This formula takes into account the combined effects of resistance and capacitance in the circuit.
