resistors Re: Sam's High-Energy Double Car Ignition Coil Driver... Update

why not look around for an old heater, electric stove, or toaster or coffee
pot and use that resistance element?

>It varies enormously with filament temperature. At 'normal' operation
>you can calculate it easily. Assuming it's rated 240V, 500W :
>Current is 500/240 = 2.08A, R = V/I = 115R
>It may however be a quarter of this when cold.