| The Shop > Electronics & IC Programing |
| Digital oscilloscope project/kit |
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| RobWilson:
My bad John I copied wrong part number :Doh: , I meant this one p# 312-612 12 - 0 - 12 3A 72VA Chassis Transformer So you reckon the op amps need upgrading , any recommendations mate . Rob |
| RobWilson:
Anyway to small , why use VA ? is VA just Watts ? volts x amps . Rob |
| awemawson:
VA is WATTS with the Power Factor taken into consideration. Power Factor relates to the way the phase of the voltage and current vary. Typical PF of a motor is 0.8 https://en.wikipedia.org/wiki/Power_factor http://www.power-solutions.com/watts-va |
| RobWilson:
Hi Andrew so if an electric motor was 240v x8A x 0.8 pf = 1536 VA or near enough 1.5Kva , any idea what the power factor of a transformer would be ? is that another can of worms lol Rob |
| awemawson:
Big transformers have PFs nearer to unity whereas little ones can be as low as 0.5 - it depends how much trouble they went to designing the magnetic circuit http://www.the-power-factor-site.com/Transformer-Capacity.html |
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