Transcription of ELECTRONIC FORMULAS - TSCM
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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&s) 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). ICE: Current (I) comes before (leads) Voltage (E) in a capacitor (C). Resistors in Series Rtotal ' R1 % R2 ' R3 % .. R1 R2. Two Resistors in Parallel Rt ' Resistors in Parallel, General formula R1 % R2. 1. Rtotal '. 1 1 1. % % %.. R1 R2 R3. Resonant Frequency FORMULAS *Where in the second formula f is in kHz and L and C are in microunits.
E ’ IR ’ P I ’ PR P ’ I2R EI E 2 R E ’ IZ ’ P I cos 1 ’ P Z cos 1 P ’ I2 Z cos 1 ’ IE cos 1 ’ E 2 cos 1 Z pf ’ Active power (in watts ) Apparent power (in volt &s ) ’ P E I pf ’ R
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