When electrons move from a negatively charged end to end positively charged at a conductor, meaning it has made an effort electricity. Electric power is the rate of electron working on an electrical effort. This means that electrical power is the capacity of a business in which electricity is used. Electrical power is measured in watts (W) or kilowatt (kW). In which the electric power of one watt of electricity required to supply a current of one ampere at a pressure of one volt electricity. Or mathematically pesrsamannya can be written as follows:
Power = Voltage x Electric Current
Power said to be the average work done per unit of time. Mathematically be written as follows:
In the circuit of alternating current, voltage and current are not in phase. So to obtain the correct electrical power (active power) in a series bolakbalik current, voltage and current multiplication remains to be multiplied by the value of the power factor. Where the power factor is the ratio between active power (measured with a wattmeter) and multiplication of voltage and current Normally, the power factor is expressed in percentage.
Mathematically, the power factor can be expressed as follows:
In the direct current circuit, multiplying the voltage and current value of electric power required by the circuit, where the power factor is not required in this circuit. World industrial use watts for appliances that consume electricity in small quantities. Examples of electrical equipment that uses watts is the electric iron, rice cooker, and hair dryer. Refrigeration and ventilation equipment typically employs a unit of horsepower (hp) and British thermal units (Btu).
Where 1 hp = 746 watts and 1 watt = 3.41 Btu / hour.
1 Hp = 746 watts
1 watt = 3.41 Btu / hour
Conversions are commonly used in industrial refrigeration and air to calculate the capacity of an electric heater in Btu / hour, when the known value of the electric power in watts. Conversion of watts to Hp units are also sometimes required. In science lessons you already know, that effort is the work done by a force of satuNewton to move objects as far as satumeter. Effort is energy.
In the Law of Conservation of Energy says that energy can not be generated and no dapatdihilangkan. Just move from satubentuk energy into other forms. For example, hydroelectric, energy from water yangbergerak transformed into electrical energy, the electrical energy will be transformed into heat energy cahayadan energy if the electric anergy tersebutmelewati a lamp. The amount of electric power that has been used within a certain time unit commonly known as electrical energy.
Wattjam measured electrical energy (Wh). For example, a powerful 5000 watt heater that operates for 2 hours, then these heaters consume electric energy of 10,000 wattjam (Wh). Consumption of electric energy drawn by the electrical equipment only indicates the amount of power that has been used by the equipment over a given period. The size of the electrical energy in units of watts Wattjam stating the amount that has been used within a certain time unit.
Unit kilowatt-hour (kWh) is commonly used to calculate electrical energy consumption which has been used for a certain period. To measure the electric energy consumption is used a measuring tool called kWhmeter. Companies engaged in the field of electrical energy lazm sell electricity in units of kWh.