BlueCollarOhm’s law
V = I × R • I = V ÷ R • R = V ÷ I.
ELECTRICIANS
Electrical
Electrical math, conduit helpers and formula references. Use the tabs below to switch between working calculators and quick field-reference material.
Electricians
Ohm's Law
Calculate volts, amps, watts, or ohms from two known values.
Open calculator → ElectriciansVoltage Drop
Estimate voltage drop by amps, one-way distance, voltage, phase, and copper wire size.
Open calculator → ElectriciansConduit Fill
Quick helper to estimate percent fill from conduit inside diameter and total wire area.
Open calculator →Field-reference aid. Use approved drawings, current codes/standards, manufacturer data and job-specific procedures for final decisions—especially for lifting, electrical, pressure, fire-protection and life-safety work.
Power
DC / single-phase resistive: P = V × I. Three-phase real power: P = √3 × V × I × PF.
Voltage drop
Voltage drop depends on conductor resistance, length and current. Use the governing code and project criteria for allowable drop.
Code note
Ampacity, box fill, conduit fill and protection rules must be checked against the adopted electrical code and equipment listing.
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