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is equivalent to a pure resistance. (E5C12) '''The coordinate system that is often used to display the resistive, inductive, and/or capacitive reactance components of an impedance is rectangular coordinates.''' (E5C13) The coordinate system that is often used to display the phase angle of a circuit containing resistance, inductive and/or capacitive reactance is polar coordinates. (E5C14)
When the circuit is switched off, a capacitor retains the energy it has gathered, though slight leakage usually occurs. A variety of capacitors (shown in color) in circuit board. Capacitance is expressed as the ratio of the electric charge on each conductor to the potential difference (i.e., voltage) between them. The capacitance value of a capacitor is measured in farads (F), units named for English physicist Michael Faraday (1791â1867). A farad is a large quantity of capacitance. Most household electrical devices include capacitors that produce only a fraction of a farad, often a thousandth of a farad (or microfarad, ÂµF) or as small as a picofarad (a trillionth, pF).