Anonymous asked in Science & MathematicsEngineering · 1 month ago

How do you calculate the maximum continuous load of an ac to dc power supply?

I vaguely recall reading an article about finding the intended continuous load of an ac to dc power supply.  It went something like:

1. Measure the output voltage with no load.

2. Apply a high wattage 1k ohm rheostat to the output and adjust it until the voltage is 10% of the no load voltage.

3. Use ohm’s law to calculate the maximum current that can be safely drawn from the power supply.

Assuming a no load voltage less than 15 volts does this sound reasonable? 

1 Answer

  • 1 month ago

    Find the specs of all of the parts in the Power supply and make sure they are not exceeded by using a suitable circuit breaker or fuse in the primary.

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