Yeah, I see what you mean.
Those cables will work for 1 fan, but 3 draw three times the current and will need a lower resisitance. They would burn out with the 3 fans
Looking on Maplin I have found 10Ω and 18Ω resistors so I could put them in series to get the required resistance but they are only rated at 0.6W. My thought was to then have the same again in parallel with the first.
I think this would give me the wattage rating of 1.2W but maintain the resistance at 21Ω?
If someone could confirm this or set me straight I'd be mighty grateful!
I think I've solved it! I found a calculator
that works out the total resistance for resistors in parallel. It shows that my original theory was complete pants!!
I'm now awaiting a resistor pack from Maplin