| R |
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noun - The eighteenth letter of the Appendix:Roman script, English alphabet, preceded by Q and followed by S.
abbreviation - (context, US politics) Republican
- (film certification) restricted
- reverse
- right (as opposed to left)
- (context, handbells) ring
- (context, baseball, cricket) The statistic reporting the number of runs scored by a player
- Thursday
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| radio wave |
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noun
- (physics) electromagnetic radiation having a wavelength between about .5 centimeters and 30,000 meters; used for the broadcasting of radio and television signals.
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| reactance |
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noun (symbol X)
- (context, physics, electric) opposition to the change in flow of current in an alternating current circuit, due to inductance and capacitance; the imaginary part of the impedance
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| reactive |
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adjective
- that reacts or responds to a stimulus
- (chemistry) that readily takes part in reactions
- francium is the most reactive of the alkali metals.
- (electronics)Characterized by induction rather than capacitance.
- Reacting to the past rather than anticipating the future, not predictive.
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| receptacle |
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noun
- A container
- Botanical term for that part of the flower stalk (peduncle or pedicel) to which the floral parts are attached; also torus.
- In the Asteraceae, the end of the peduncle to which all of the florets of the flower head are attached.
- (electrical) US -- a contact device installed at an outlet for the connection of an attachment plug and flexible cord to supply portable equipment or appliances.
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| rechargeable |
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adjective
- able to be recharged, especially of a battery that can be recharged from mains electricity via a charger
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| rectifier |
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noun
- something that rectifies
- a device that converts alternating current into direct current; often a diode
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| rectify |
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verb (rectif, i, ed)
- (transitive) To correct or amend something.
- (transitive, chemistry) To purify or refine, especially by distillation.
- (transitive, electronics) To convert alternating current into direct current.
- (transitive) To add water to alcoholic spirit to adjust its proof.
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| regulator |
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noun
- A device that controls or limits something.
- The voltage stopped working and the resulting overload destroyed the device.
- A person or group that sets standards of practice, especially those established by law.
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| relay |
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noun
- (electronics) An electrical actuator that allows a relatively small electrical voltage or current to control a larger voltage or current.
- (context, athletics) A track and field discipline where runners take turns in carrying a baton from start to finish. Most common events are 4x100 meter and 4x400 meter competitions.
verb - to verbally pass information from one person to another, to speak
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| reluctance |
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noun
- unwillingness to do something
- hesitancy in taking some action
- (physics) that property of a magnetic circuit analogous to resistance in an electric circuit
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| resonance |
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noun
- The condition of being resonant.
- Something that evokes an association, or a strong emotion.
- (physics) The increase in the amplitude of an oscillation of a system under the influence of a periodic force whose frequency is close to that of the system's natural frequency.
- (context, nuclear physics) A short-lived subatomic particle that cannot be observed directly.
- 2004: When experiments with the first "atom-smashers" took place in the 1950s to 1960s, many short-lived heavier siblings of the proton and neutron, known as "resonances", were discovered. " Frank Close, Particle Physics: A Very Short Introduction (Oxford 2004, p. 35)
- An increase in the strength or duration of a musical tone produced by sympathetic vibration.
- (chemistry) The property of a compound that can be visualized as having two structures differing only in the distribution of electrons.
(rfc, reword/combine definitions - should be three?)
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| rheostat |
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noun
- An electrical resistor, with two terminals, whose resistance is continuously variable by moving a knob or slider
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| rotary |
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noun (rotaries)
- a traffic circle
- an international club for community service
adjective
- having rotation
- A engine revolves the heads rather than having pistons go back and forth.
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| rotor |
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noun
- A rotating part of a mechanical device, for example in an electric motor, generator, generator, alternator or pump.
- The wing of a helicopter or similar aircraft
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