Power Equals Current Times Voltage

In the international system of units the unit of power is the watt equal to one joule per second.

Power equals current times voltage. So watts are equal to power factor times amps times volts. In physics power is the amount of energy transferred or converted per unit time. The current is equal to the electromotive force of the source divided by the total circuit resistance. That is when the circuit is resistive.

P t v t i t at any one time t. Electric power is usually produced by electric generators but can also be supplied by sources such as electric batteries it is usually supplied to businesses and homes as domestic mains electricity by the electric power industry. In a dc circuit the power is equal to the voltage times the current or p v i. Power power p is a measure of the rate at which energy is delivered or used by a circuit element.

For example the voltage of a battery which is stable over a long period of time will be symbolized with a capital letter e while the voltage peak of a lightning strike at the very instant it hits a power line would most likely be symbolized with a lower case letter e or lower case v to designate that value as being at a single moment in time. If you don t know one of voltage or current you can calculate it from ohm s law. Note that energy charge is multiplied by charge time to give energy time. What is power consumption in watts when the power factor is 0 8 and the phase current is 3a and rms voltage supply is 110v.

The power dissipated across a resistor or any device for that matter is watts or voltage times current. For direct current dc power p can be calculated by multiplying the voltage and current when they are known. Power is a scalar quantity. This is also true in an ac circuit when the alternating current and voltage are in phase.

Voltage sources deliver power while resistors use power by dissipating it as heat. In older works power is sometimes called activity. P w v v i a ac ohm s law formula. P v i.

Electric power is the rate per unit time at which electrical energy is transferred by an electric circuit the si unit of power is the watt one joule per second. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. Power voltage alternating current. The voltage v in volts v is eqaul to the current i in amps a times the impedance z in ohms ω.

At any one point in time t in alternating current ac circuitry power p t equals voltage v t times current i t. W pf a v. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms. The power p in watts w is equal to the voltage v in volts v times the current i in amps a.

1 power is just how much energy you have per second mbox 1 watt frac mbox 1 joule mbox 1 second 2 voltage is how much energy you have per charge.