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ELECTRONIC FORMULAS - TSCM

ELECTRONIC FORMULAS . Ohm's Law FORMULAS for D-C Circuits. E ' IR '. P. ' PR E2. P ' I 2R ' EI '. I R. Ohm's Law FORMULAS for A-C Circuits and Power Factor. P PZ E 2 cos1. E ' IZ ' ' P ' I 2 Z cos1 ' IE cos1 '. I cos1 cos1 Z. In the above FORMULAS 1 is the angle of lead or lag between current and voltage and cos 1 = P/EI = power factor or pf. Active power (in watts) P R. pf ' ' pf '. Apparent power (in volt&amps) EI Z. Note: Active power is the "resistive" power and equals the equivalent heating effect on water. Voltage/Current Phase Rule of Thumb Remember "ELI the ICE man". ELI: Voltage (E) comes before (leads) current (I) in an inductor (L).

2 (for series circuit ) Z ’ RX R 2%X (for R and X in parallel ) Q ’ X L R or X C R 2-7.1 ELECTRONIC FORMULAS Ohm's Law Formulas for D-C Circuits. Ohm's Law Formulas for A-C Circuits and Power Factor. In the above formulas 1 is the angle of lead or lag between current and voltage and cos 1 = P/EI = power factor or pf.

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