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General-Purpose Relay AC Input cosφ Calculation

Author: manhtaiExecutions: 18
TOP/Shared Formulas (Engineering)/Electrical & Circuits

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Calculate the cosφ of the AC input coil of a general-purpose relay
Input: Supply voltage (Vin), coil current (Iin), coil resistance (R)
Output: cosφ
R
Ω
Vin
V
Iin
mA
cosφ 
cosφ = R[Ω]/(Vin[V]/Iin[mA] × 1000)

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