I have a 16 ohm 1.25 ampere 25 watt rheostat that has gone bad. Is it okay to replace it with a 16 ohm 1.7 ampere 50 watt rheostat?

  • \$\begingroup\$ Bigger is better! \$\endgroup\$
    – Kartman
    Commented Mar 23, 2021 at 5:12
  • \$\begingroup\$ Using only 1.25 A/ 1.7A means next time it won’t burn out the contacts fast. (Arhennius Law) in theory about 4 times longer and more if used on resistive loads. , but for speakers on high damping ratio power amps limited to 25W. A woofer damping ratio is degraded badly RL/Rs. WD40 comes to mind with 101 uses. \$\endgroup\$ Commented Mar 23, 2021 at 6:57
  • \$\begingroup\$ Sure, it will last longer! \$\endgroup\$ Commented Mar 23, 2021 at 8:58
  • \$\begingroup\$ Why didn’t you say why it / how it failed? How does anyone know how many amps you are using? Maybe you need a 2A rheostat? \$\endgroup\$ Commented Mar 23, 2021 at 16:30

1 Answer 1


Yes, using the rheostat below it’s maximum rating is fine.

  • \$\begingroup\$ Yes. You have to worry if the max current and max power is low. \$\endgroup\$
    – upali
    Commented Mar 23, 2021 at 10:55
  • \$\begingroup\$ Why did it fail then? \$\endgroup\$ Commented Mar 23, 2021 at 16:33

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