Motor Guides 11 min read
400 kW to HP: Convert 400 Kilowatts to Horsepower
Convert 400kw to hp with the exact formula. See 400 kW in mechanical, metric and electrical horsepower, plus motor and engine examples.
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Practical electrical conversion, appliance energy, battery sizing, and motor current guides with formulas, charts, and worked examples.
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Showing 1–12 of 19 articles
Motor Guides 
Electrical Calculations 11 min read
How Can You Calculate Power? Choose the Right Formula
Learn how to calculate power from volts, amps, resistance, energy, time, and power factor using the correct DC, single-phase, and three-phase formulas.
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Circuit Fundamentals 10 min read
How to Find the Voltage Across the Resistor
Calculate voltage across the resistor using Ohm’s Law, series, parallel, node-voltage and loaded voltage-divider methods with clear examples.
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Power Fundamentals 13 min read
Kilowatt vs kVA: What Is the Difference?
Compare kilowatt vs kVA, learn real and apparent power, convert kW and kVA using power factor, and interpret generator and transformer ratings.
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Electrical Calculations 11 min read
Power Calculation Formula for DC, Single-Phase, and Three-Phase Systems
Find the correct power calculation formula for DC, single-phase and three-phase circuits, including watts, kW, kVA, power factor and efficiency.
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Power Fundamentals 12 min read
Voltage Power: How Voltage Affects Electrical Power
Understand the voltage power relationship, calculate watts from volts and amps, and see how voltage affects resistive, constant-current, and AC loads.
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Power Fundamentals 13 min read
Volts vs Amps: What Voltage and Current Actually Mean
Learn the difference between volts and amps, how voltage and current work together, and what charger, battery, appliance, and safety ratings mean.
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Power Fundamentals 11 min read
Watt’s Law: How Power, Voltage, and Current Relate
Learn Watt’s Law, P = VI, how to find watts, volts or amps, use the power triangle, and understand how it differs from Ohm’s Law.
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Generator Guides 11 min read
What Size Generator for 300 Amp Service? A Load-Based Answer
A 300A, 120/240V service equals 72kVA at full load, but generator size depends on actual demand, starting loads, fuel and load management.
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Electrical Calculations 11 min read
5000 Watt to Amps: Conversion Formulas, Voltage Chart, and Examples
Convert 5000 watt to amps at 12V, 24V, 48V, 120V, 230V, and 240V. See AC, DC, three-phase, inverter, and generator calculations.
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Appliance Energy 11 min read
Amp Chart for Household Appliances: Watts, Volts, and Current Draw
Use this amp chart for household appliances to compare watts, volts, running current, startup demand, circuit loads, generators, and inverter needs.
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Battery Guides 12 min read
Battery kWh Calculator: Find Capacity, Usable Energy, and Runtime
Use a Battery kWh calculator to convert volts and Ah into energy, estimate usable capacity and runtime, and size solar or backup battery storage.
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