Wattage voltage and current relationship

How to Convert Watts to Amps Simplified -- Converting Amps to Watts the easy way

wattage voltage and current relationship

Ohms calculations. The resistance R in ohms (Ω) is equal to the voltage V in volts (V) divided by the current I in amps (A). The resistance R in ohms (Ω) is equal. In the first place, forget frequency, and understand the relationship between voltage V in volts, current I in amperes, and power in watts. In this analogy, voltage is equivalent to water pressure, current is wire when an electric current of one ampere dissipates one watt of power.

Watts/Volts/Amps/Ohms conversion calculator

The same, because there is no time when V times I is not equal to w. Typical wall power is not like that, of course.

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Rather than instantaneously switching between positive and negative voltage, it swings smoothly with a sinusoidal curve. So the light bulb dissipates maximum power when the voltage is maximum in the positive direction, zero when the voltage is zero, and maximum again when the voltage is maximum in the negative direction.

wattage voltage and current relationship

So if the wall frequency is 60hz or 50hz or hz in some airplanesthe power dissipation actually varies between maximum and zero at a rate of twice that. But since the filament takes a longer time to get hot and cool down, it seems to be on steadily.

wattage voltage and current relationship

The running average power is constant. Now, if there are different kinds of load, such as an inductive or capacitive load, or a mixture, you get different power dissipation, because the current is not necessarily in sync with the voltage. But that's another story. In case you're interested in what current and voltage actually are, simple household plumbing is a good analogy. Voltage is like pressure, and current is like water flow.

wattage voltage and current relationship

In fact, a piece of metal wire is almost exactly like a water pipe, except it is chock full of electrons that can move freely. The letter used to represent current in an equation is I. Electric current is measured in Amperes, shortened to Amps or simply the letter A.

wattage voltage and current relationship

A current of 2 Amps can be written as 2A. The bigger the current the more electricity is flowing.

QUICK TIP — What’s the difference between Amps, Volts and Watts?

Ohms are the base unit of resistance in an electrical system. The ohm is defined as "an electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the conductor not being the seat of any electromotive force. In our battery diagram above, if we remove the bulb and reconnected the wire so the battery was short circuited, the wire and battery would get very hot and the battery would soon be flat because there would be virtually no resistance in the circuit.

Without any resistance, a huge electrical current would flow until the battery was empty. Once we add a bulb to the circuit, resistance is created. There is now a local "blockage" or narrowing of the pipe, per our water pipe analogy where the current experiences some resistance. This greatly reduces the current flowing in the circuit, so the energy in the battery is released more slowly.

What's the Difference Between Amps, Volts and Watts?

As the battery forces the current through the bulb, the battery's energy is released in the bulb in the form of light and heat. In other words, the current carries stored energy from the battery to the bulb, where it is turned into light and heat energy. The image above shows a light bulb as the main cause of electrical resistance.

A watt is the base unit of power in electrical systems.