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zgozvrm
New Member
8 Posts |
 Posted - 01/16/2010 : 14:02:41
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To actually calculate the power (without energizing the transformer), you will either need to have the value of the inductance of the primary coil (in Henrys). You would obtain this value either from the manufacturer's specifications (unlikely with most transformers), or by using an inductance meter.
Using this value, you can obtain the inductive reactance (XL = 2 * Pi * f * L) where f is the frequency of the voltage being applied and L is the inductance in Henrys. Also, you will need the resistance of the primary coil (use an ohmmeter). With these 2 values, you can obtain the total impedance Z = sqrt(XL squared + R squared). The current would then be determined by I=E/Z and the power would then be P = I x E (or, P = E squared / Z).
Otherwise, you could just take an amp reading with a clamp-on meter and calculate the power by multiplying that value by the voltage. |
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Primary current
