Voltage is the measure of potential energy per unit of charge, and is measured in Volts. is measured in Volts (V) which is a measure of the amount of energy per unit of charge (Joules per Coulomb). include chemical reactions (like in batteries) where energy is released allowing electrons to be moved around, or generators where mechanical energy is converted by using magnetic fields to influence the movement of electrons in metal wires. This is the force applied to charged particles such as electrons that will cause them to move. In a metal the outer electrons of the atoms are ‘free’ to move around therefore if it is connected to a battery or another source of e.m.f. the electrons will be repelled from the negative terminal and attracted to the positive terminal constituting an electric current. When the electrons are moving from one place to another we call this an electric current. Notice that it is the electrons that are doing the moving around and that the protons stay where they are, fixed in the nucleus of atoms. If there is an excess of electrons on an object then it will have an overall negative charge, if electrons are removed then the object will have an overall positive charge due to the remaining protons. What we call ‘static electricity’ is a buildup or lack of electrons which are a negatively charged particle. Electricity involves the charged particles (electrons and protons) that make up ordinary matter. A battery does not hold electricity, but it is a store of energy that is used to make electrical processes work. After reading this page you should be familiar with many of the aspects of electricity and electronics which should help you to understand man of the other pages on this site.Įlectricity is a term used to describe a physical process involving subatomic particles in materials. Table: Amps to Watts at 12V DC Table showing amps converted to watts at 12 volts DC.This page details the most common terms used in electronics and often physics subjects. Table: Amps to Watts at 120V & 240V AC Table showing amps converted to watts at 120 and 240 volts AC for common appliances and circuit sizes. You can also use our amps to kW calculator to solve for kilowatts. Since 1 kilowatt is equal to 1,000 watts, it is possible to use the formulas above to also convert amps to kW, but the result will need to be divided by 1,000. The power P in watts is equal to the current I in amps squared multiplied by the resistance R in ohms. You can also convert amps to watts using circuit resistance with this formula: This formula calculates the power delivered by all three wires in a three-phase system, but you’ll need to divide by three if you’re considering a single wire in the three-phase system. The power P in watts is equal to the current I in amps multiplied by the voltage V in volts multiplied by the power factor PF multiplied by 3. This equation calculates the power for one pair of wires in a three-phase system, but you’ll need to multiply it by three when considering all three pairs of wires in a three-phase system.įor three-phase AC circuits where the current, line to neutral RMS voltage, and power factor are known, the formula to convert amps to watts is: The power P in watts is equal to the current I in amps multiplied by the voltage V in volts multiplied by the power factor PF multiplied by the square root of 3. The formulas to convert amps to watts for three-phase AC circuits are a bit different from the formulas above.įor three-phase AC circuits where the current, line to line RMS voltage, and power factor are known, the formula to convert amps to watts is: If you’re trying to calculate PF from power, current, and voltage, we suggest using a power factor calculator to find the PF value. The power factor is determined by the alternating current frequency and the inductive or capacitive elements in the circuit. The magnitude of both real and reactive together is called the apparent power, and the PF gives the ratio of real power to apparent power. The power P in watts is equal to the current I in amps multiplied by the voltage V in volts multiplied by the power factor PF.ĪC electrical power is composed of a real part expressed in watts and a reactive part expressed in volt-amps. So, 15 amps of current at 120 volts will generate 1,800 watts of power.Ĭonverting amps to watts for a single-phase AC circuit with a power factor requires a slight variation of the formula. For example, let’s calculate the wattage capacity of a 15-amp, 120-volt electrical circuit.
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