Generator Sizing from Connected and Starting Loads
Learn how connected running load, motor starting load, and transfer load affect generator sizing and where calculator results need final review.
Guides
Elecatrix educational articles support calculators and field workflows.
Motor Starter and Contactor Sizing
Size a motor starter and contactor by separating motor current, contactor duty, coil VA, and control-circuit load before final equipment selection.
Inverter Sizing and Efficiency Explained for Backup Power
Inverter wattage, surge load, efficiency, and DC input all shape backup power sizing. Learn how these factors connect and where runtime planning fits in.
Harmonics, K-Factor, and Transformer Heating
Learn how harmonic currents increase transformer heating, how K-factor weights harmonic order, and why crest factor and load measurements matter.
Motor Overload vs Breaker/Fuse Protection
Learn how motor overload protection, branch-circuit breakers or fuses, and disconnects serve different functions in a motor circuit.
Transformer Regulation and Voltage Drop
Learn how transformer voltage regulation differs from feeder voltage drop, how the effects combine, and what voltage the load actually receives.
Neutral Load Calculation
Learn what neutral load calculation evaluates, which load records matter, and why shared neutrals and nonlinear loads need closer review.
Commercial Electrical Load Calculation
Use a commercial electrical load calculator to organize load schedules, equipment blocks, feeders, HVAC, kitchen, and data-center planning inputs.
Insulation Resistance Temperature Correction
Use an insulation resistance temperature correction calculator to normalize readings, compare tests consistently, and support insulation condition trending.
Delta-Wye Transformer Voltage and Current
Use a delta wye transformer voltage current calculator to review line and phase relationships, current handoff, and transformer planning inputs.
Earth Resistance vs Soil Resistivity
Learn how earth resistance vs soil resistivity differ, when each value applies, and how to evaluate grounding electrodes, rods, and grids.
Transformer Impedance and Short-Circuit Current
Use a transformer impedance short circuit current calculator to estimate secondary fault current, screen equipment ratings, and identify what requires study review.
Transformer Inrush Current
Use a transformer inrush current calculator to estimate energization surge, review duration, and identify when protection coordination needs review.
VFD Sizing and Cable Length
Use a VFD sizing cable length calculator to match drive current to the motor, assess output cable constraints, and route harmonic review correctly.
EV Charger and Heat Pump Service Impact
Use an EV charger heat pump service load calculator to plan added electrical demand, compare service headroom, and identify when review is needed.
Buck-Boost Transformer Sizing
Learn how to calculate buck-boost transformer corrective kVA, select the right voltage connection, and verify field conditions before installation.
Motor Voltage Drop During Starting
Calculate motor starting voltage drop using locked-rotor current, circuit impedance, and length to estimate motor terminal voltage during acceleration.
Ohms, Kilohms, and Megohms: Resistor Unit Conversion Guide
Convert ohms, kilohms, and megohms accurately. Learn Ω, kΩ, and MΩ conversion steps, verify resistance with Ohm’s law, and avoid input errors.
Resistor Tolerance Bands Explained
Learn how resistor tolerance bands set the minimum and maximum actual resistance. Compare gold ±5% and silver ±10% bands with formulas and examples.
How to Read a 4-Band Resistor Color Code
Learn how to read a 4-band resistor color code using two significant digits, a multiplier, and a tolerance band. Decode 150 Ω, 1.5 kΩ, and 150 kΩ examples.
1.5 kOhm Resistor Color Code
A 1.5 kOhm resistor equals 1,500 ohms. Decode the brown-green-red resistor color bands, identify tolerance, and verify the value for circuit use.
150 kOhm Resistor Color Code
Decode a 150 kOhm resistor color code. Learn why brown-green-yellow equals 150,000 ohms, calculate tolerance limits, and check the resistor in voltage-divider and circuit applications.
150 Ohm Resistor Color Code
Learn the 150 ohm resistor color code: brown, green, brown, plus a tolerance band. Calculate its resistance range and verify the component with a meter.
Resistor Color Code Chart for 150 Ohm, 1.5 kOhm, and 150 kOhm
Decode 4-band resistor color codes for 150 ohm, 1.5 kOhm, and 150 kOhm resistors. See band colors, tolerance ranges, formulas, and verification steps.