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SteveElectric power is measured in Watts. The wattage of a light bulb IS the power it uses. Watts = anps x volts. 100 watt lamp at 120 volts draws .83 amps. The wattage rating of a light bulb is governed by the length of the filament which is only a resistance wire. Shorter wire, less resistance, brighter light.
Electrical power is measured in watts. The power is calculated by multiplying the current flowing through the circuit (in this case, the bulb) by the potential difference across it. So:
P = I V
Power (watts) = current (amps) x potential difference (volts)
One watt is the equivalent of using up one joule of energy per second.
The bulb can be designed to be operated with a certain voltage across its filament ... e.g. 12v, 24v, 120v, 240v, etc.
When operated at the recommended voltage, the expected current will flow through the filament,
resulting in an expected rate of energy consumption, usually indicated on the bulb or its packaging,
expressed in watts.
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What does conversion of electrical power to mechanical power mean?
There is no such thing as 'electrical power' or 'mechanical power' or, in fact, any other sort of power. Power is simply a rate -the rate of doing work. In SI, power is measured in watts. An obsolete unit of power is a horsepower. Although, in the Unites States, the power of an engine is usually measured in horsepower, elsewhere it is measured in watts (or, more usually, kilowatts).So, when an engineer describes converting electrical power to mechanical power, what he actually means is the rate of converting electrical energy to mechanical energy.
What is the unit for measuring electrical power?
Electrical power is measured in watts.AnswerPower is measured in watts. There is no such thing as 'electrical power' as power is simply a rate.voltThe basic unit of electrical power is the watt. If the power is very large, then kilowatts (thousands of watts) or megawatts (millions of watts) are also used.Power is simply a rate, so you cannot really have 'electrical' power, 'mechanical' power, etc. In the SI system of measurements, power is measured in watts (W).Electric power is usually measured in watts, kilowatts, or sometimes megawatts. One watt is equal to one volt-ampere or one joule per second.Electric power is the rate at which an electrical circuit transfers electric energy. The SI unit of power is the watt which is one joule per second.Wattage, Watts, and (W) are what power is measured in there just different ways to say watts."Watts" is the term used to define a quantity of power. If you were looking for a device used to measure power, that is called a wattmeter.Technically, power is a measure of how fast energy is consumed, so energy can be measured as power multiplied by time.AnswerThere is no such thing as 'electrical' power, as power is simply a 'rate'. Power is a measure of the rate of doing work, transferring energy, or of heat transfer. As energy, work, and heat are all measured in joules, power is measured in joules per second which, in SI, is given a special name: the watt.Another example of a 'rate' is velocity. We do not describe different times of velocity; neither should we describe different types of power.Electrical power in SI is measured in watts, or joules per second. It is equal to current times voltage, which is also equal to current squared times resistance. (P=IV and V=IR, where P is power, I is current, V is voltage, and R is resistance.)The watt is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt. The unit, defined as one joule per second, measures the rate of energy conversion.
What is the unit of electrical power?
Watt
What is the practical unit of power in engineering?
The SI unit for power is the Watt, the most commonly derived unit is for electrical power definition, which is the Kilowatt.
How is power measured?
In physics, power is the rate at which energy is transferred, used, or transformed. The unit of power is the joule per second (J/s), known as the watt (in honor of James Watt, the eighteenth-century developer of the steam engine). For example, the rate at which a light bulb transforms electrical energy into heat and light is measured in watts-the more wattage, the more power, or equivalently the more electrical energy is used per unit time.
