400w how many amps

Converting watts to amps for a single-phase AC circuit with power factor uses a slightly different formula. In other words, the current I in amps is equal to the power P in watts divided by the voltage V in volts multiplied by the power factor PF.

For three-phase AC circuits where the line to line voltage is known, the formula to convert watts to amps is:. The current I in amps is equal to the power P in watts divided by the line to line voltage V in volts multiplied by the power factor PF multiplied by the square root of 3. For three-phase AC circuits where the line to neutral voltage is known, the formula to convert watts to amps is:. The more water flowing through the hosepipe, the stronger the current is. Volts are the measurement used to determine how much force is needed to cause the electric current to flow.

In keeping with the earlier example, you could think of volts as the water pressure in the hosepipe, which makes the water flow. Amps multiplied by Volts equals Watts, which is the measurement used to determine the amount of energy. The higher the wattage is, the more power and output from the appliance.

In terms of the hosepipe example, this would refer to the amount of water being released. For direct current DC the electric current flows only in one direction. Online Calculator. I will give you some examples:. We can design your system for you, using a computer based Power System designing software. We will require detailed information on your envisaged power usage including power ratings and hours per day usage of lights, appliances etc.

Please fill in and submit a quote request for a residential solar system. NOTE: These figures are a guide only and the wattage ratings may vary greatly from one appliance to another. NOTE: Brush type motors without a load do not require a significantly higher starting current than their continuous current rating.

Read all about the power requirements of various appliances run from an inverter.