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Confusion of watts and watt-hours

Power and energy are frequently confused in the general media. Power is the rate at which energy is used (or generated). A watt is one joule of energy per second. For example, if a 100 watt light bulb is turned on for one hour, the energy used is 100 watt-hours or 0.1 kilowatt-hour, or (60x60x100) 360,000 joules. This same quantity of energy would light a 40-watt bulb for 2.5 hours. A power station would be rated in watts, but its annual energy sales would be in watt-hours (or kilowatt-hours or megawatt-hours). A kilowatt-hour is the amount of energy equivalent to a steady power of 1 kilowatt running for 1 hour, or 3.6 megajoules.

Terms such as 'watts per hour', which are sometimes used in the media, are meaningless in practice. Actually it tells the change of power per hour.

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List of Wattages

Microwatt

The microwatt (symbol:μW) is equal to one millionth (10-6) of a watt.

Milliwatt

The milliwatt (symbol:mW) is equal to one thousandth (10-3) of a watt. A typical laser pointer might output 5 milliwatts.

Kilowatt

The kilowatt (symbol: kW), equal to one thousand watts, is typically used to state the power output of engines and the power consumption of tools and machines. A kilowatt is approximately equivalent to 1.34 horsepower. An electric heater with one heating element might use 1 kilowatt

Megawatt

The megawatt (symbol: MW) is equal to one million (106) watts.

Many things can sustain the transfer or consumption of energy on this scale; some of these events or entities include: lightning strikes, large electric motors, naval craft (such as aircraft carriers and submarines), engineering hardware, and some scientific research equipment (such as supercolliders and large lasers). A large residential or retail building may consume several megawatts in electric power and heating energy.

The productive capacity of electrical generators operated by utility companies is often measured in MW. Modern high-powered diesel-electric railroad locomotives typically have a peak power output of 3 to 5 MW, whereas U.S. nuclear power plants have net summer capacities between about 500 and 1300 MW.[2]

According to the Oxford English Dictionary, the earliest citing for "megawatt" is a reference in the 1900 Webster's International Dictionary of English Language. The OED also says "megawatt" appeared in a 28 November 1847, article in Science (506:2).

Gigawatt

The gigawatt (symbol: GW) is equal to one billion (109) watts. This unit is sometimes used with large power plants or power grids.

Terawatt

The terawatt (symbol: TW) is equal to one trillion (1012) watts. The average power usage by humans (about 15 TW) is commonly measured in these units. The most powerful lasers from the mid 1960s to the mid 1990s produced power in terawatts, but only for nanoseconds.

Petawatt

The petawatt (symbol: PW) is equal to one quadrillion (1015) watts.

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More than 10,000,000 watts and less than 100,000,000 watts

34,270,000 watts = 46,000 horsepower Titanic Queen Mary vs. Titanic AdmirIbrahimagić

25,000 watts (approximately 30 horsepower) Mechanical energy produced by an automobile engine while cruising. Wikipedia - Watt

5,000 watts Electric oven How much electricity does my stuff use?

5,000 watts Clothes dryer How much electricity does my stuff use?

3,800 watts Water heater How much electricity does my stuff use?

3,800 watts Central Air conditioner How much electricity does my stuff use?

3,250 watts Electric kettle (about the maximum for a household applicance)

1,500 watts Microwave Oven How much electricity does my stuff use?

Lest than 1000 watts and more than 100 watts

1 horsepower = 745.699872 watts

450 watts Refrigerator How much electricity does my stuff use?

375 watts An athlete working at their peak for 30 minutes. Wikipedia - Watt

200 watts A person climbing a flight of stairs. Wikipedia - Watt

150 watts A typical used computer.

150 watts 42" plasma television (average of 90 watts for black and 270 watts for white) The Cost of Leaving Your Computer On

120 watts 17" CRT monitor

A human climbing a flight of stairs is doing work at a rate of about 200 watts

typical automobile engine produces mechanical energy at a rate of 25,000 watts

A typical household incandescent light bulb uses electrical energy at a rate of 25 to 100 watts

fluorescent lights typically consume 5 to 30 watts.

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Less than 100 watts and more than 10 watts

80 watts Human Power Generator

60 watts Lightbulb

60 watts Television

60 watts Apple iMac Apple Makes the Switch, SteveJobs looked at processor performance per watt.

45 watts Laptop computer How much electricity does my stuff use?

40 watts Carbon neutral PC

40 watts 17" LCD monitor

28 watts VCR Household Power Usage

20 watts Computer monitor

17 watts Solo computer for Africa (prototype)

15 watts How Green is Your PC?: New Home Computer System Reduces Power Usage. Gregoire Gentil has of Zonbu has created the $99 Zonbox, a PC which will use 15 watts of power. It keeps its data online.

11 watts Computer that is "off"

10 watts Computer speaker

9 watts Low powered fanless processor up to 1 GHz

8.5 watts Solo computer for Africa (production model)

5 watts Fit-PC by Compulab in Israel

4 watts Keeping keyboard, mouse, network adapter, modem alert.

4 watts Expected power usage for our USB FlashDriveEditor Includer

3.75 watts = 750mA x 5 V MOPS/520 processor at 100 Mhz

2.5 watts Maximum for USB port

2 watts Phone charger

1 watt Clock radio

1 watt Webcam

.75 watt = 150mA x 5 V USB flash drive typical high-speed use

.6 watt = 120mA x 5 V Illuminated keyboard

.6 watt = 120mA x 5 V Gumstix WaySmall 200Mhz computer uses a maximum .12 Amps and when idle, 0.03-0.04A.

.3 watt = 60mA x 5 V Minimum keyboard consumption AT-2-SERIAL programmable Interface Adaptor

.25 watt = 50mA x 5 V Mobile phone with backlight on.

.11 watt Optical mouse

.04 watt Windbelt, Cheap Generator Alternative, Set to Power Third World. Thank you, LucasBlog!

.025 watt = 5mA x 5 V Mobile phone on standby.

.024 watt Wireless ball mouse

.018 watt AlphaSmart Neo

.017 watt (7.2 mAh) Wireless keyboard Home Electronics Input Devices

.01 watt = 2mA x 5 V Standby for USB flash drive.

.004 watt = Atmel AVR picopower processor, running on 0.4 milliamps active, 0.1uA standby.

.003 watt = 1mA x 3 V Foldable keyboard

Includer

Ricardo: I need to look at how much power USB Flash Drives use when they are just doing nothing. They have a microcontroller in them that must use some power. See the picture of the internals at http://en.wikipedia.org/wiki/USB_flash_drive

Computer Power Usage

Battery Life

AndriusKulikauskas, October 4, 2007: How long T does a 1.5 Volt AA battery last if it is powering a device that uses W Watts?

Links

solar powered computer and video camera with, using car batteries

• price 682$
• 30W

portable solar power system

different kind of batteries

lots of informations on batteries

5 watt solar panels

DIY solar car battery charger

Types of power

* Power (physics), the amount of work done or energy transferred per unit of time o Human power is the amount of work a human does in a period of time o Motive power is power which moves something o AC power in electrical engineering is the complex form of power o Optical power of a lens is the inverse of its focal length o Effective radiated power in radio telecommunications is a measure of radio station antennas o Electric power generation is the process of converting any form of energy to electrical energy, as in: + power station + nuclear power + solar power + wind power + wave power + tidal power + geothermal power + hydropower

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Electricity Consumption

Digital camera uses 1/60 Joule = 1/60 Watt hours per picture.

Mobile phone use 10 kWh/household/yr but the corresponding mobile phone system uses 90 kWh/household/year.

Desktop computer uses 200 to 400 kWh per year, laptop 80 to 140, server 1500 (which is 1 ton of CO2 emissions). EfficientProducts.org

Energy Costs

Leaving a computer on at all hours costs $200 per year at California rates of .1428 USD per kilowatt-hour. What would it cost in Africa?

Household electricity rates around the world. Note that electricity rates in South Africa are about 40% of the rates in the US.

Note: We had 50 wattages at the start of December 2008.

AboutThisPage

• FlashDriveEditor = How much power is needed by the keyboard, display, USB drives, processor?
• FlashDriveEditorTask = Calculate our power needs for the keyboard, display, USB drives, processor module. Can we do it with AA batteries? And for how many hours?
• MathEncyclopedia=Power is measured in Watts.

RUSMIR TOPCIC POSTED: Confusion of watts and watt-hours, List of Wattages, Types of power, More than 10,000,000 watts and less than 100,000,000 watts,

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