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Resistance applies to both d.c. and a.c. circuits, and is determined by the resistivity, length, and cross-sectional area of a conductor.
In d.c. circuits, resistance is the only opposition to the passage of current. However, in a.c. circuits, the flow of current is opposed, not only by resistance, but also by reactance. Reactance is caused by a circuit's inductance or capacitance, or both, and varies with the frequency of the supply. Like resistance, reactance is also measured in ohms.
So, in a.c. circuits, the combination of resistance and reactance is called 'impedance'.
Impedance is not the algebraic sum of resistance and reactance, but the vectorial sum. So if, for example, an a.c. circuit had a resistance of 3 ohms and a reactance of 4 ohms, the impedance would be 5 ohms, not 7 ohms.
What else can I help you with?
What is the opposition to the current flow?
resistance is the opposition to the flow of electric charge
What are three components that make up impedance?
Impedance is composed of three key components: resistance, reactance, and frequency. Resistance represents the opposition to direct current (DC) flow, while reactance accounts for the opposition to alternating current (AC) flow due to inductance and capacitance. Inductive reactance increases with frequency, and capacitive reactance decreases with frequency, affecting the overall impedance in AC circuits. Together, these components determine how electrical circuits respond to alternating current.
What is net impedance?
Net impedance is the total opposition that a circuit presents to the flow of alternating current (AC), combining both resistance and reactance. It is represented as a complex number, where the real part corresponds to resistance and the imaginary part represents reactance, which can be inductive or capacitive. The net impedance affects how current and voltage interact in the circuit, influencing the phase relationship between them. Understanding net impedance is crucial for analyzing AC circuits and optimizing their performance.
Is it the impedance value same in AC and DC?
Since impedance is the vector sum of resistanceand reactance, and since reactance is a function of frequency, impedance only really applies to a.c. circuits. You could argue that, in a d.c. circuit, impedance is equal to resistance, but the term really isn't normally used in d.c.
What is the opposition to voltage change called?
The opposition to voltage change in an electrical circuit is referred to as "impedance." Impedance is a complex quantity that encompasses both resistance and reactance, affecting how alternating current (AC) flows in a circuit. It determines how much a circuit resists changes in voltage and current. In direct current (DC) circuits, this opposition is simply referred to as resistance.
What is the opposition of current flow measured in?
The opposition of current flow is measured in ohms. For DC circuits it is resistance and for AC circuits it is impedance.
What is the opposition to the current flow?
resistance is the opposition to the flow of electric charge
What does electrical impedance refer to?
It is the complex ratio of the voltage to the AC (alternating current) circuit. It extends the concept of resistance to AC circuits due to magnitude and phase.
How you can calculate ampere?
Voltage (volts) divided by Resistance (ohms). For AC circuits the resistance part of this formula is replaced by "impedance" which involves the effects of capacitors and inductors as well.
Total opposition to current flow in an AC circuit with both resistance and reactance is called?
Impedance.
Why do not you use impedance in DC circuit?
Actually, its a matter of terminology... Impedance can be used in a DC circuit. We just call it resistance, however, transient analysis would imply a different notation. To be clear, impedance is normally used in AC circuits, and it is the electrical opposition to AC, taking into account not only voltage, but phase angle. In a DC circuit, impedance and resistance are the same thing, simply with a phase angle of zero.
What are three components that make up impedance?
Impedance is composed of three key components: resistance, reactance, and frequency. Resistance represents the opposition to direct current (DC) flow, while reactance accounts for the opposition to alternating current (AC) flow due to inductance and capacitance. Inductive reactance increases with frequency, and capacitive reactance decreases with frequency, affecting the overall impedance in AC circuits. Together, these components determine how electrical circuits respond to alternating current.
What is net impedance?
Net impedance is the total opposition that a circuit presents to the flow of alternating current (AC), combining both resistance and reactance. It is represented as a complex number, where the real part corresponds to resistance and the imaginary part represents reactance, which can be inductive or capacitive. The net impedance affects how current and voltage interact in the circuit, influencing the phase relationship between them. Understanding net impedance is crucial for analyzing AC circuits and optimizing their performance.
Is it the impedance value same in AC and DC?
Since impedance is the vector sum of resistanceand reactance, and since reactance is a function of frequency, impedance only really applies to a.c. circuits. You could argue that, in a d.c. circuit, impedance is equal to resistance, but the term really isn't normally used in d.c.
What is the opposition to voltage change called?
The opposition to voltage change in an electrical circuit is referred to as "impedance." Impedance is a complex quantity that encompasses both resistance and reactance, affecting how alternating current (AC) flows in a circuit. It determines how much a circuit resists changes in voltage and current. In direct current (DC) circuits, this opposition is simply referred to as resistance.
What is impedance in speakers and can it be measured in watts?
Impedance in electricity is described as an opposing force to electron flow. It consists of a combination of resistance, capacitance, and inductance. This forms the actual "resistance" to electron flow in a circuit versus "pure resistance"such as a resistor added in a circuit to slow electron flow. Impedance is more prevalent in AC circuits versus DC circuits as it reacts to AC current flow much more than DC current. Current flow in a speaker circuit is considered AC so impedance is more meaningful in a speaker setup. Impedance can be measured or calculated based upon current flow so it can be converted to watts using the formula Watts = amps times voltage.AnswerImpedance is the vector sum of resistance and reactance, and is measured in ohms. No, it cannot be measured in watts, which the unit for power.
Is impedance and resistance are different?
Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Impedance is a more general term for resistance that also includes reactance.
