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The rating of any electrical appliance or piece of electrical equipment is calculated in watts because the watt is the international unit for power.
The electrical power of a purely resistive load is calculated using the Power Equation:
Power (watts) = Voltage (volts) x Current (amps)
For a reactive load - such as an ac electric motor - the Power Equation has to be modified to allow for its Power Factor:
Power (watts) = Voltage (volts) x Current (amps) x Power Factor
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoIt isn't. Energy is measured in Joules or sometimes Watt-hours. The quantity that is measured in Watts is the power, that is, the rate at which energy is produced, the amount of energy supplied per second.
The Watt is the international standard unit of power (that is, of the rate at which energy is supplied, transferred, used, or dissipated). The International System of Units (Système international d'unités) is designed so that the units work well together, so Watts are the easiest units of power to use when you are working with current in Amperes, electrical potential in Volts, energy in Joules, etc. Because of this, it is very easy to work out how much power is delivered in Watts if you know the e.m.f. in Volts and the current in Amperes: multiply Volts times Amperes to get Watts. And then you can go on to an easy conversion to energy: Watts times seconds equals Joules.
The alternative to using Watts as a unit of power would be horsepower, which is much harder to convert when considering current and voltage.
Wiki User
∙ 14y agoThe power of light bulbs are measured in wattage (watts) and/or lumens.
Wiki User
∙ 11y agoThe wattage of each bulb will be printed on the end of the glass globe. Also there you will find the operating voltage of the bulb.
Wiki User
∙ 13y agoIt is a unit of power: the rate at which energy is produced, transfer, converted, or used. 1 watt is the same as 1 joule/second.
Wiki User
∙ 12y agoWatt is the international unit for power. ALL power is measured in watt - unless some non-standard unit is used. 1 watt is equivalent to 1 joule / second.
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Is a watt a unit of power or a unit of electrical energy?
Watt is a unit of power. 1 Watt = 1 Joule/second; joule is the unit for energy.
What is a word for unit of power?
A "watt" is a derived unit of power.
Why is 60 watts written on the bulb?
It is probably a 60 watt bulb (believe it or not). Bulbs are rated in watts. A 100 watt bulb is brighter and consumes more power than a 60 watt bulb
What is the difference between power and watt?
Power is a quantity, and the watt is its unit of measurement.
Defined as one joule of energy expended over one second of time?
A joule / second is a watt. The watt is a unit of power. In general terms, power means energy expended, produced, or transferred, per time unit.A joule / second is a watt. The watt is a unit of power. In general terms, power means energy expended, produced, or transferred, per time unit.A joule / second is a watt. The watt is a unit of power. In general terms, power means energy expended, produced, or transferred, per time unit.A joule / second is a watt. The watt is a unit of power. In general terms, power means energy expended, produced, or transferred, per time unit.
If a lamp bulb is rated at 100 watt why is a time factor not in the rating?
The unit watt is defined as energy per unit time. Thus a 100W light bulb consumes 100J of energy each second. Joules are a unit of energy. Watts are a unit of power.
Does a high watt bulb give more energy than a low watt bulb?
More watts means it uses more energy per second (watt is a unit of power). If it is a light-bulb of the same type of technology, the higher-watt light bulb would also give off more light.
Is a watt a unit of power or a unit of electrical energy?
Watt is a unit of power. 1 Watt = 1 Joule/second; joule is the unit for energy.
When did James watt invent light bulb?
James Watt did not invent the light bulb. Thomas Edison is regarded by most people to have invented it. There were other similar ideas to the light bulb before Edison, however, it was his superior design and set up of entire electrical lighting systems that brought fame and popularity to his bulb. James Watt, is responsible for giving us the unit of measuring power that is his name (watt). The unit is derived by extending on Ohms law, to include that Voltage (e) times Amperage (i) = power.
What is a word for unit of power?
A "watt" is a derived unit of power.
What uses more energy a 60 watt light bulb or 18 watt light bulb?
This depends on how long it is being used. The 60 Watt bulb consumes 2.6667 times the power of an 18 Watt bulb, but energy equals power times time. There is also an amount of 'hidden' energy: the energy to manufacture and transport the bulb. This depends on how long it is being used. The 60 Watt bulb consumes 2.6667 times the power of an 18 Watt bulb, but energy equals power times time. There is also an amount of 'hidden' energy: the energy to manufacture and transport the bulb.
The watts in a light bulb named after James Watt?
The watt was named after James Watt. The term watt in electric appliances refers the rate at which energy is generated or consumed and therefore is measured in units (e.g. watts) that represent energy per unit time. An example; when a light bulb with a power rating of 100W is turned on for one hour, the energy used is 100 watt hours (The watt second is a unit of energy, equal to the joule).
What is the unit to power?
watt
What is a lumen How does it relate to watts?
A lumen is a unit of luminous flux, which is the amount of light emitted per unit time. A watt is a unit of power (such as electrical power), which is the amount of energy consumed per unit time. Light bulbs have ratings in watts, which measures how much electricity they use, and lumens, which measures how much light they give off. For the same kind of bulb (incandescent, fluorescent, LED, etc.), a bulb with a higher wattage will produce more lumens. However, a 10-watt LED or compact fluorescent bulb may produce more lumens than a 40-watt incandescent bulb.
Why is 60 watts written on the bulb?
It is probably a 60 watt bulb (believe it or not). Bulbs are rated in watts. A 100 watt bulb is brighter and consumes more power than a 60 watt bulb
What unit of measurement represent true power?
The unit of measurement that represents true power is the watt (W).
What SI unit is used to express power?
the answer for the si unit of power is the watt or w
