Quote:
Originally Posted by kvflyer
I'm thinking that in a series circuit, the current is always the same, not double?
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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.