So I've been doing a bit of reading on using diodes to slow fans down. Most reference the 1n4001 which is rated for a 1 amp load. What about controlling heavier loads (think water pump)? Could I use several in parallel or does that do something different? Or is there a better, higher rated diode with the same voltage drop? I've seen some rectifier diodes good for 30 amps, but I have no idea how to understand the voltage/current specs.