Electric power is the ability or capacity to conduct a business or energy. If the home installed power of 900 watts, meaning that the amount of capabilities that can be used to do work or electrical energy is of 900 watts. The advantage of that capacity, there will be a blackout or termination by means of a power strip mounted by officers PLN. In incandescent bulbs, electricity is converted into energy form of light and heat.
Had a lit lamp in one hour, then during the lamp using a certain power. When the lamp was lit for two hours, of course, the lamp uses electricity as much as twice that of one hour. From the above it can be concluded that: “The amount of power that is used, directly proportional to the time of lighted lamps”. When reviewing the amount of energy used in one second (unit of time), then it will get power or power usage.
The amount of power written notation hutuf P watts (W). Watt name is taken from a physicist and machinery of the English name of James Watt (1736-1810). In electrical circuits, the power is proportional to the voltage and current. This statement can be written in the form of the following equation:
P = I x V
P: electrical power in watts (W),
I: electric current in amperes (A), and
V: is alistrik voltage in volts (V).
In a light bulb will be found at the instructions voltage and power consumption. The voltage is the voltage specified in the maximum number allowed in the bulb. Power consumption (watts) shown is the power consumption of the light bulb when connected to the maximum allowed voltage. For example: a lamp voltage of maximum 110 volts with a power of 60 watts (110 V / 60 W) or maximum voltage of 220 volts with a power of 40 watts (220 V / 40 W), or now many who reads the voltage between 220 V to 240 Volt with a power of 75 watts (220V-240V / 75 W), and others.
A number of electric power can be either power or energy. With the power it can get hot, light, movement, sound, and others. The occurrence of electrical power when there are free electrons in a conductor driven. Due to the electric pressure then formed electric potential. Unit amount of electrical power that can cause named watt power or electrical energy in a given time in units of joules or watt seconds or kWh.
The relationship between the electric power (P) in watts (W), power or electrical energy (W) in joules (J), and the length of usage time (t) in seconds or hours, may be written by the equation:
W = P xt
because:
P = VI, then W = (VI) xt = V x I xt
P = I2.R, then W = (I2.R) xt = I2 x R xt
So formulas power or electrical energy that is widely used is:
