Power Voltage Time Equation

How much power does it use.

Power voltage time equation. Substituting the current for a capacitor into this equation gives you the following. Power within an electrical circuit is only present when both voltage and current are present. The power formula is used to compute the power resistance voltage or current in any electrical circuit. 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 standard metric unit of power is the watt. We ve seen the formula for determining the power in an electric circuit. 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. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor.

If there is ac look also at the power factor pf cos φ and φ power factor angle phase angle between voltage and amperage. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. Assuming zero initial voltage the energy w c t stored per unit time is the power. In the above circuit we know we have a battery voltage of 18 volts and a lamp resistance of 3 ω.

Power is a scalar quantity. P w t 5b power is consumption of energy by consumption of time. By multiplying the voltage in volts by the current in amps we arrive at an answer in watts let s apply this to a circuit example. The power consumed in the resistor can be calculated as.

Example energy lost in a resistor. Work done w 300 j time taken t 10 s. T time s alternative power can be expressed. Power voltage current resistance p v i r calculator.

In physics power is the amount of energy transferred or converted per unit time. Integrating that equation gives you the energy stored in a capacitor. In older works power is sometimes called activity. An electric machine makes use of 300 j of energy to do work in 10s.

Power formula 1 electrical power equation. Power p i v r i 2 v 2 r where power p is in watts voltage v is in volts and current i is in amperes dc. For example in an open circuit condition voltage is present but there is no current flow i 0 zero therefore v 0 is 0 so the power dissipated within the circuit must also be 0 likewise if we have a short circuit condition current flow is present but there is no voltage v 0 therefore 0 i 0. This calculator is based on simple ohm s law as we have already shared ohm s law p i v r calculator in which you can also calculate three phase current.

How to use ohm s law to determine current. P 12 v 2 50 ohm 2 9 w. Learn the power formula. In the international system of units the unit of power is the watt equal to one joule per second.

A 12 v battery is connected in series with a resistance of 50 ohm.