"robb" writes:

i have a sewing machine motor controler (wired in series with motor) that
uses a"carbon pile element" where pressure on the pile causes decrease
resistance
and more current to flow and at some pressure point a short by passes the
carbon pile

controler is rated at 95-145 volts and 0.7 amps

now someone has claimed no troubles using the controller with a 120v - 1 amp
motor

is this true ? why or why not

i thought the motor , rated 1 amp, would try to draw more current than the
controller was rated for and of course overheat etc

Well, it probably does, and the speed control is probably getting hotter
than before. But there is a safety margin built in so it hasn't melted
down just yet.

Or, just because the motor says 1 A doesn't necessarily mean it draws
1 A except under heavy load.

Has he measured the current?

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