Power Energy Current Equation

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Power energy current equation. In physics power is the amount of energy transferred or converted per unit time. Q i x t charge current x time. How many watts w were used. In the international system of units the unit of power is the watt equal to one joule per second.

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. Power power p is a measure of the rate at which energy is delivered or used by a circuit. The equation for watts is given on the right. Therefore the total charges that flow through.

P e t power energy time. The two most important equations in electricity are given below. Other equations that you should know include. 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.

If a complete circuit is made using a resistor with a resistance r the current flowing through the circuit can be found by using the equation v ir the current is equal to the electromotive force of the source divided by the total circuit resistance. It takes a particular kettle 1 minute and 46 seconds to boil a quantity of water. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. What was the power used i e.

V i x r voltage current x resistance. The time taken was 1 x 60s 46s 106 seconds we can now simply enter the number of joules 240 000 and the number of seconds 106 into the calculator. Resistors are rated by the maximum power they can have developed in them without damage but power ratings are rarely quoted in parts lists because the standard ratings of 0 25w or 0 5w are suitable for most circuits. Power is a scalar quantity.

Therefore potential difference current is the rate of charge flow. When calculating the real power consumption of an electrical device it is essential to measure the voltage applied and the current consumed taking into account the power that is dissipated in the circuit. Relationship between energy transferred current voltage and time the potential difference or voltage v across two points is defined as the energy e dissipated or transferred by a coulomb of charge q that moves through the two points. You can see from the equation p i r that for a given resistance the power depends on the current squared so doubling the current will give 4 times the power.

The equations that are used for electricity. In older works power is sometimes called activity.