Zenith 25MC33 Set

[kvflyer]

Originally Posted by Electronic M

2x 18M 2W in series is 36M 4W. I would be concerned that a 1W part wouldn't be able to handle that.
There's no harm in placing 2-4 1W or higher resistors in series and or parallel to spread out the power. If I'm spending the money to special order unusual values of parts for a set I rather over build then under build.

I'm thinking that in a series circuit, the current is always the same, not double?

[Electronic M]

Originally Posted by kvflyer

I'm thinking that in a series circuit, the current is always the same, not double?

You're not wrong, but power is not current. Power is voltage times current, or current squared times resistance. Replacing 2 resistors of equal value with a single part you're doubling the resistance in the second equation and doubling the voltage drop across the resistor in the first equation so 1 part needs to be 2x the wattage of 2.


I like Yamamayas solution of 2 18M 2W parts... Can't get the math wrong if you are not doing any math.