impedance
/ɪmˈpiːdns/ (bre, ipa) · /ɪmˈpiːdns/ (ame, ipa) · /im-ˈpē-dᵊn(t)s/ (ame, mw)
impedance — noun
1. the combined force that slows or blocks the flow of electricity in a circuit tha
the combined force that slows or blocks the flow of electricity in a circuit that carries changing current (alternating current). It includes the effects of resistance, capacitance, and inductance, and is measured in a unit called the ohm.
Élise measured the impedance of the new speakers to see if they matched the amplifier.
measure + impedance + of [component]
The cable had a high impedance, so the signal grew weak before reaching Daichi's recorder.
high impedance causes signal loss
Nia checked the impedance value printed on the back of the old guitar amplifier.
In physics lab, students calculated a circuit's total impedance using a coil and resistors.
The engineer designed the circuit board to keep the input impedance as low as possible.
- resistance
Related but distinct — resistance applies to DC circuits and is only one part of impedance; impedance includes both resistance and reactance for AC circuits.
- reactance
The component of impedance that comes from capacitance and inductance, not from pure resistance.
- conductance
The measure of how easily electricity flows through a circuit — the opposite of impedance.
文法句型
the impedance of [device/circuit]
[adjective] impedance
impedance + verb
用法筆記
Impedance is the AC (alternating current) equivalent of resistance in DC (direct current) circuits. The symbol is Z, and the unit is the ohm (Ω). Commonly used in speaker specifications, audio equipment, and circuit design. Input impedance and output impedance are two frequently encountered types.