I found a suitable battery for my laptop, but I need to know if it's close to 10 hours or so battery life. I can't seem to find the conversion for it, and I haven't had physics in a long time.
2007-03-26 03:36:45 · 5 answers · asked by ♫ Shinedown ♫ 3 in Science & Mathematics ➔ Physics
Watt hours are a unit of energy. A watt is a unit of power equal to 1 joule per second; a watt hour is (1 joule/second) * (60 seconds/minute) * (60 minutes/hour), or 3600 joules. So a battery saying it delivers 171 watt hours is just saying that it delivers (171 * 3600 joules) or 615,600 joules. In order to convert that to a time, you need to know what the power consumption of your device is. If you have a 1-watt device, the battery will power it for 171 hours; if you have a 171-watt device, your battery will power it for 1 hour. If your device requires less than 17 watts, your battery will power it for more than 10 hours.
2007-03-26 04:12:53 · answer #1 · answered by Grizzly B 3 · 1⤊ 0⤋
171 watt hours means the power cosnumption in watts multiplied by time in hours is 171. So, if your laptop consumes 40 watts, the battery will last about 4 hours. For the battery to last for 10 hours, you would need a very power efficient laptop which consumes just about 15 - 16 watts power, which is unlikely.
If you have a 40 watt tubelight, it would consume 40 watt hours in 1 hour. I hope it is clear now.
2007-03-26 03:44:34 · answer #2 · answered by Swamy 7 · 0⤊ 0⤋
If you take 171 and divide it by how many watts your laptop uses, that will tell you the lifetime of the battery. I seriously doubtyou'll get 10 hours out of it. That's a strange way to spec it though. Usually the spec is milliamp-hours. If you're doing serious computing, you can expect to draw 30 watts or more.
2007-03-26 03:57:14 · answer #3 · answered by Gene 7 · 0⤊ 0⤋
Watts is a term or measurement of heat derived from the product of voltage and amperes. If you were to burn a 171 watt (voltage x amps) light bulb for one hour that would be expressed as 171 watt-hours, so there's one hour in 171 watt-hours, but at another voltage or ampers the hours would be dependant on the formula, volts x amps = watts x hours changing any value of voltage or amperage or both could change the wattage and so 171 watt-hours could take longer or shorter to get there.
2007-03-26 05:23:12 · answer #4 · answered by Farley 2 · 0⤊ 0⤋
It depends on the draw of electricty.
Yeah what that guy down there said....
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2007-03-26 03:40:27 · answer #5 · answered by Anonymous · 0⤊ 0⤋