Power for rotational motion is equally as important as power in linear motion and can be derived in a similar way as in linear motion when the force is a constant. In older works power is sometimes called activity.
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It is represented as p.
Power consumption formula physics. Power always comes up in the discussion of applications in engineering and physics. You abbreviate a watt as simply w so a 100 watt light bulb converts 100 joules of electrical energy into light and heat every second. It is the work time ratio.
24 x 365 x 10 watts 1 000 87 6 kwh calculation for the energy consumption of a vacuum cleaner. The energy expended to do work in unit time is termed as power. E kwh day p in watts time number of usage hours per day 1000 w kw or the number of hours you use it per day x the number of days uses x wattage of the electrical appliance in watt 1 000 kwh energy consumed by appliance.
Power is the rate at which work is done. Power is work or energy divided by time so power has the units of joules second which is called the watt a familiar term for just about anybody who uses anything electrical. The equation used to calculate the power is.
Power is a scalar quantity. Mathematically it is computed using the following equation. Re arranging the power calculation formula above gives.
The capacity to do work is termed as energy. Power formula is articulated as or where the energy consumed to do work e work done w time taken t in any electrical circuit the power is computed making use of these three formulas. As is implied by the equation for power a unit of power is equivalent to a unit of work divided by a unit of time.
Power frac work done time taken p frac e t this is when. This physics video explains how to calculate power consumption. Annual energy consumption of radio alarm.
Calculation for the energy consumption of a radio alarm a radio alarm is on all the time and therefore uses energy continuously. I p 3 pf v if your power is in kilowatts i e thousands of watts it s best to either convert it to watts by multiplying by 1 000 or keep it in kilowatts make sure your voltage is in kilovolts kv volts 1 000. This video is meant for students studying in class 9 and 10 in cbse ncert and other state boa.
The linear power when the force is a constant is p vec f. Power work time or p w t. Power consumption calculation formula.
In physics power is the amount of energy transferred or converted per unit time. In the international system of units the unit of power is the watt equal to 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.
The standard metric unit of power is the watt. Power p is measured in watts w work done e is measured in.
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