On a schematic I have, some resistors read as R16, 0.025R, 3W. Some read as R60, 33R. I guessed that R16 or R60 are the labels, and 3W is the power. But what does 0.025R or 30R mean? Google search did not help much. Thanks.
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Related: http://electronics.stackexchange.com/questions/90699/wire-wound-inductors-naming – Ignacio Vazquez-Abrams Apr 22 '15 at 16:15
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1So many possible duplicates: http://electronics.stackexchange.com/questions/246920/what-is-a-100r-resistor – Always Confused Aug 09 '16 at 10:15
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http://electronics.stackexchange.com/questions/45272/resistor-value-labeling-what-does-the-second-number-refer-to http://electronics.stackexchange.com/questions/107698/what-does-5k1-in-the-given-schematic-mean http://electronics.stackexchange.com/questions/28053/what-does-3v3-or-1v8-mean – Always Confused Aug 09 '16 at 10:17
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In this context "R" means \$\Omega\$.
It really just substitutes for the decimal point and tells you the multiplier. You'll also see inductors marked 1R0 for 1.0\$\mu\$H, and resistances given as 4K7 or 10K0 for 4700\$\Omega\$ and 10,000 \$\Omega\$.
So the resistor with ID R16 is a 0.025 Ohm resistor and the resistor with ID R60 is a 33 Ohm resistor.
Spehro Pefhany
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@Chu If it starts with "R" in this context, that is the reference designator. This is generally why the value of the resistors don't contain "R"s. – ACD Apr 22 '15 at 15:57
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@EMFields Yes, thanks, some weird editing there- no doubt my fault. – Spehro Pefhany Apr 22 '15 at 17:55
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Different manufacturers = different methods. The K, M or R can be the decimal point. 33K = 33KΩ, 4K7 = 4.7kΩ. Surface mount 472 = 4.7kΩ or 4701 = 4.7kΩ at a higher precision. – StainlessSteelRat Apr 22 '15 at 18:05