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Re: Solenoid from a car door, any car door: are they legal in 2016?
Quote:
Originally Posted by GeeTwo
Power = IV = V2/R. If the resistance across its inputs is more than 14.4 ohms, you can probably use that as proof that the solenoid uses no more than 10W at 12V. If not, you'll probably need some more documentation from the manufacturer.
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An actuator rated for less than 10W electrical power consumption, continuous duty at 12VDC, might have a electrical resistance less than 14.4 Ohm when it is at room temperature. Conductors heat up while they are dissipating power, and their resistivity increases as they get warmer. Most solenoid actuators, and especially those made for use as car parts, are rated for operation while their conductors (and their electrical insulation systems) are quite a bit warmer than typical room temperatures. A room temperature resistance of 12 Ohm measured on an actuator that is rated for 10W at 12V would not surprise me at all. If the insulation system is rated for under-hood automotive applications, 10 Ohms would not be unusual.
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Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
Last edited by Richard Wallace : 15-02-2016 at 08:15.
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