# Common Resistors

#### noteleks

Joined May 10, 2009
5
I am having to buy special resistors for old radios. I have to have a minimum buy. What would be common resistors that are used for different electronic projects? That way I can buy some other resistors that I probably will use later when I expand my hobby to modern electronics. Thank you.

#### bill2009

Joined Apr 17, 2009
31
what size(wattage) are your radio resistors - do the standard value ones have to be the same? That might make them large for everyday electronics use.

#### tom66

Joined May 9, 2009
2,591
Two 1MΩ resistors in series is equivalent to 2MΩ.

#### Wendy

Joined Mar 24, 2008
21,840
Actually, you only need a ¼W for a 2MΩ resistor. I wouldn't want to be close to the voltage that uses half that wattage.

What resistors have you decided on?

I've done something similar, and posted it here, but mine was a lot easier because they were all ¼W.

#### beenthere

Joined Apr 20, 2004
15,808
Check my math if you want - for 350 volts (figuring on highest imaginable B+) and 2M to ground, you get .175 mills. Using I^2 * R, that is 61 milliwatts (.06125 actual). More that I would have thought, but a long way from 1 watt.

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#### Wendy

Joined Mar 24, 2008
21,840
Sigh. I should have done the math. Still 354V RMS or DC is pretty significant.

#### ifixit

Joined Nov 20, 2008
650
Also... don't forget to check that the resistors voltage rating is not being exceeded.