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Q&A What does it mean for a signal to have impedance?

$$Z = R + jX $$R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hott...

posted 1y ago by TonyStewart‭  ·  edited 12mo ago by TonyStewart‭

Answer
#6: Post edited by user avatar TonyStewart‭ · 2023-04-05T01:31:40Z (12 months ago)
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • The ideal L & C components are considered lossless with no resistance but one must be aware of the actual R values from the design and datasheet.
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
  • For more details:
  • [RLC impedance chart](https://www.google.com/search?q=rlc+chart+impedance&sxsrf=AJOqlzWwwWPBD6inAbsBVunHRMrgaHUXrg:1679383649354&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjF1vHOv-z9AhXILzQIHX-lAJYQ_AUoAXoECAEQAw&biw=1280&bih=561&dpr=1.25)
  • [RLC nomogram](https://www.google.com/search?q=rlc+chart+nomograph&tbm=isch&ved=2ahUKEwik1rnQv-z9AhVILVkFHf7TCpYQ2-cCegQIABAA&oq=rlc+chart+nomograph&gs_lcp=CgNpbWcQAzoECCMQJ1DAFVjzJmDzNWgAcAB4AIABb4gB-waSAQM5LjGYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=ZFwZZKSUJsja5NoP_qersAk&bih=561&biw=1280)
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • The ideal L & C components are considered lossless with no resistance but one must be aware of the actual R values from the design and datasheet.
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
  • For more details:
  • [RLC impedance chart](https://www.google.com/search?q=rlc+chart+impedance&sxsrf=AJOqlzWwwWPBD6inAbsBVunHRMrgaHUXrg:1679383649354&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjF1vHOv-z9AhXILzQIHX-lAJYQ_AUoAXoECAEQAw&biw=1280&bih=561&dpr=1.25)
  • [RLC nomogram](https://www.google.com/search?q=rlc+chart+nomograph&tbm=isch&ved=2ahUKEwik1rnQv-z9AhVILVkFHf7TCpYQ2-cCegQIABAA&oq=rlc+chart+nomograph&gs_lcp=CgNpbWcQAzoECCMQJ1DAFVjzJmDzNWgAcAB4AIABb4gB-waSAQM5LjGYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=ZFwZZKSUJsja5NoP_qersAk&bih=561&biw=1280)
  • AI answer:
  • Impedance is a measure of the opposition that a circuit presents to the flow of an alternating current (AC) signal. It is represented by a complex number that has both magnitude and phase. Impedance is a combination of resistance (which causes loss or dissipation of energy) and reactance (which does not cause loss but instead alters the phase relationship between the voltage and current in the circuit).
  • Reactance is a measure of how much a circuit opposes the change in the flow of an AC signal. It is determined by the circuit's inductance and capacitance and is measured in ohms. Inductive reactance (XL) results from an inductor's tendency to resist changes in the current flowing through it, while capacitive reactance (XC) results from a capacitor's tendency to resist changes in the voltage across it. Both XL and XC are proportional to the frequency of the AC signal.
  • In a circuit with impedance, the loss or dissipation of energy is represented by resistance, which is also measured in ohms. Resistance is a property of a material or component that determines how much current flows through it for a given voltage applied across it. In a circuit with resistance, the voltage and current are in phase, meaning they rise and fall together.
  • In summary, impedance is a measure of the total opposition to the flow of an AC signal, and it includes both resistance (which causes loss or dissipation of energy) and reactance (which does not cause loss but instead alters the phase relationship between the voltage and current in the circuit). The reactance is further divided into inductive and capacitive reactance, which are proportional to the frequency of the AC signal.
#5: Post edited by user avatar jonathan_the_seagull‭ · 2023-03-27T17:27:43Z (about 1 year ago)
Added hyperlinks.
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • The ideal L & C components are considered lossless with no resistance but one must be aware of the actual R values from the design and datasheet.
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
  • For more details
  • https://www.google.com/search?q=rlc+chart+impedance&sxsrf=AJOqlzWwwWPBD6inAbsBVunHRMrgaHUXrg:1679383649354&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjF1vHOv-z9AhXILzQIHX-lAJYQ_AUoAXoECAEQAw&biw=1280&bih=561&dpr=1.25
  • https://www.google.com/search?q=rlc+chart+nomograph&tbm=isch&ved=2ahUKEwik1rnQv-z9AhVILVkFHf7TCpYQ2-cCegQIABAA&oq=rlc+chart+nomograph&gs_lcp=CgNpbWcQAzoECCMQJ1DAFVjzJmDzNWgAcAB4AIABb4gB-waSAQM5LjGYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=ZFwZZKSUJsja5NoP_qersAk&bih=561&biw=1280
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • The ideal L & C components are considered lossless with no resistance but one must be aware of the actual R values from the design and datasheet.
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
  • For more details:
  • [RLC impedance chart](https://www.google.com/search?q=rlc+chart+impedance&sxsrf=AJOqlzWwwWPBD6inAbsBVunHRMrgaHUXrg:1679383649354&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjF1vHOv-z9AhXILzQIHX-lAJYQ_AUoAXoECAEQAw&biw=1280&bih=561&dpr=1.25)
  • [RLC nomogram](https://www.google.com/search?q=rlc+chart+nomograph&tbm=isch&ved=2ahUKEwik1rnQv-z9AhVILVkFHf7TCpYQ2-cCegQIABAA&oq=rlc+chart+nomograph&gs_lcp=CgNpbWcQAzoECCMQJ1DAFVjzJmDzNWgAcAB4AIABb4gB-waSAQM5LjGYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=ZFwZZKSUJsja5NoP_qersAk&bih=561&biw=1280)
#4: Post edited by user avatar TonyStewart‭ · 2023-03-21T07:29:14Z (about 1 year ago)
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • The ideal L & C components are considered lossless with no resistance but one must be aware of the actual R values from the design and datasheet.
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
  • For more details
  • https://www.google.com/search?q=rlc+chart+impedance&sxsrf=AJOqlzWwwWPBD6inAbsBVunHRMrgaHUXrg:1679383649354&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjF1vHOv-z9AhXILzQIHX-lAJYQ_AUoAXoECAEQAw&biw=1280&bih=561&dpr=1.25
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • The ideal L & C components are considered lossless with no resistance but one must be aware of the actual R values from the design and datasheet.
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
  • For more details
  • https://www.google.com/search?q=rlc+chart+impedance&sxsrf=AJOqlzWwwWPBD6inAbsBVunHRMrgaHUXrg:1679383649354&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjF1vHOv-z9AhXILzQIHX-lAJYQ_AUoAXoECAEQAw&biw=1280&bih=561&dpr=1.25
  • https://www.google.com/search?q=rlc+chart+nomograph&tbm=isch&ved=2ahUKEwik1rnQv-z9AhVILVkFHf7TCpYQ2-cCegQIABAA&oq=rlc+chart+nomograph&gs_lcp=CgNpbWcQAzoECCMQJ1DAFVjzJmDzNWgAcAB4AIABb4gB-waSAQM5LjGYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=ZFwZZKSUJsja5NoP_qersAk&bih=561&biw=1280
#3: Post edited by user avatar TonyStewart‭ · 2023-03-21T07:28:12Z (about 1 year ago)
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • The ideal L & C components are considered lossless with no resistance but one must be aware of the actual R values from the design and datasheet.
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • The ideal L & C components are considered lossless with no resistance but one must be aware of the actual R values from the design and datasheet.
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
  • For more details
  • https://www.google.com/search?q=rlc+chart+impedance&sxsrf=AJOqlzWwwWPBD6inAbsBVunHRMrgaHUXrg:1679383649354&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjF1vHOv-z9AhXILzQIHX-lAJYQ_AUoAXoECAEQAw&biw=1280&bih=561&dpr=1.25
#2: Post edited by user avatar TonyStewart‭ · 2023-03-21T07:25:22Z (about 1 year ago)
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
  • $$Z = R + jX $$
  • R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.
  • Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.
  • But X is always a stored resistance referred to as "reactance". Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".
  • The ideal L & C components are considered lossless with no resistance but one must be aware of the actual R values from the design and datasheet.
  • Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.
  • E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.
#1: Initial revision by user avatar TonyStewart‭ · 2023-03-21T07:22:59Z (about 1 year ago)
$$Z = R + jX $$

R is a real resistance that stores energy as heat and temperature rise which depends on the thermodynamic property of thermal resistance which is impacted by an enclosure to get hotter or cooler by forced airflow.

Everything has some real resistance, even insulators with an electrode-insulation interface (called Effective Series Resistance or ESR) with some capacitance. Also, batteries and inductors have some series resistance.

But X is always a stored resistance referred to as "reactance".  Inductors have +ve reactance and Capacitors gave -ve reactance and for sine wave currents the polarity refers to how the voltage "reacts".

Energy stored in both L and C may be readily computed and be transferred from or to real power with some R value.

E.g. a Battery is a massive capacitor xx,xxx Farads above a minimum chemical voltage can power a lamp which has resistance.