Rheostat sliding contact

Hi
I have been asked to order to some rheostat sliding contacts from the Timstar catalogue for year 7 and 8. Any ideas which resistance I should choose?
Many thanks
 

STEMTech

Dave
It depends on what experiments are to be done using them. Ours are 20 ohms and can take 4 or 5 amps - enough to safely dim a 12v 25W lamp. They seem pretty versatile.
 
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