Now that you know your appliance’s power in kilowatts, you need to determine how many hours per day it is being used. Step 4: Calculate energy usage in kilowatt-hours. To convert the wattage into kilowatts (kW), divide the value by 1000: Next, multiply the amps by the voltage to calculate wattage:įor example, if your appliance uses 5 amps at 120 volts, then its wattage would be: You must also measure or find the voltage being supplied to your appliance typically, household appliances use either 120 volts or 240 volts. This information can be found either on its label or within the specifications in the user manual. The first step is to find out how many amps your appliance uses. Kilowatt-hours (kWh) – Kilowatt-hour is a unit of energy equivalent to one kilowatt (1 kW) of power used for one hour. Watts (W) – Wattage is a measure of electrical power that denotes how much work or energy is used per second.Ĥ. Voltage (Volts, V) – Voltage describes the difference in electric potential between two points in a circuit, essentially the force that pushes electrons through the wires.ģ. It represents how many electrons are flowing in a circuit.Ģ. Amperes (Amps, A) – Ampere is a unit of measurement for electrical current. In this article, we will discuss the concept of kilowatt-hours, amps, and guide you through the process of calculating kWh from amps step-by-step.ġ. It allows you to understand how much power these devices consume, which can help you better manage your utility bills and be more energy efficient.

Ventilating-air requirements: 100-125 cfm of 400C air at 1/2-in.Calculating kilowatt-hours (kWh) from amps is a common procedure when trying to determine the electricity usage of various electrical appliances.

Conversion factors: CV = (metric hp) = 735.5 watts = 75 kg-m/sec Wk2 (lb-ft) = 5.93 x GD2 (kg-m2).

Inertia constant (H) in seconds = stored kinetic energy in kW-seconds / hp (.746).Stored kinetic energy in kW-sec = 2.31 x (total Wk2) x rpm2 x 107.Approximate voltage drop (%) = motor kVA in-rush x transformer impedance / transformer kVA.kVA in-rush = percent in-rush x rated kVA.kW loss = hp (.746) (1.0 – effi ciency) / efficiency.Rated motor kVA = hp (.746) / efficiency x power factor.746 / 1.73 x kV x effi ciency x power factor Motor synchronous speed in rpm = 120 x Hz / number of poles.Amperes when kilowatts are known –> ( kW x 1000 ) / ( E x 1.73 x pf ).Amperes when horsepower is known –> ( HP x 746) / ( E x 1.73 x % eff.Amperes when kVA is known –> I = ( kVA x 1000 ) / ( E x 1.73 ).Kilovolt-Amperes –> ( I x E x 2 ) / 1000.Amperes when kilowatts are known –> ( kW x 1000 ) / ( E x 2 x pf ).Amperes when horsepower is known –> ( HP x 746) / ( E x 2 x % eff.

Amperes when kVA is known –> I = ( kVA x 1000 ) / ( E x 2 ).Power Factor cos θ –> Power Consumed /Apparent Power ( W / VA ) ( kW / kVA ).Energy Efficiency –> Load Horsepower x 746 / Load Input kVA x 1000.Amperes when kilowatts are known –> ( kW x 1000 ) / ( E x pf ).Amperes when horsepower is known –> ( HP x 746) / ( E x % eff.

Amperes when kVA is known –> I = kVA x 1000 / E.Here i discuss some of important electrical formulas.All this formulas are useful for basic calculation in Electrical Engineering including Voltage,Ampere,Power, efficiency,power factor and many more .I hope it can make your basic understanding about electrical calculation is clear.

Formula kw to amp