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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\$\begingroup\$ Related: electronics.stackexchange.com/questions/90699/… \$\endgroup\$– Ignacio Vazquez-AbramsCommented Apr 22, 2015 at 16:15
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1\$\begingroup\$ So many possible duplicates: electronics.stackexchange.com/questions/246920/… \$\endgroup\$– user107801Commented Aug 9, 2016 at 10:15
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\$\begingroup\$ electronics.stackexchange.com/questions/45272/… electronics.stackexchange.com/questions/107698/… electronics.stackexchange.com/questions/28053/… \$\endgroup\$– user107801Commented Aug 9, 2016 at 10:17
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1 Answer
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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.
answered Apr 22, 2015 at 14:39
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1\$\begingroup\$ Some other resistors read as 33K. Are they 33 kOhms? \$\endgroup\$– AdeelCommented Apr 22, 2015 at 14:41
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1\$\begingroup\$ Yes, they are 33K ohms. \$\endgroup\$ Commented Apr 22, 2015 at 14:42
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\$\begingroup\$ @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. \$\endgroup\$– ACDCommented Apr 22, 2015 at 15:57
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\$\begingroup\$ @EMFields Yes, thanks, some weird editing there- no doubt my fault. \$\endgroup\$ Commented Apr 22, 2015 at 17:55