Things you always wanted to know the answer to [Vol. 3]
Discussion
TwigtheWonderkid said:
No moon, no tides, no currents, no flow of seas, no oxygenation of the sea, no life in the sea, no life on Earth, or not as we know it. Plus without the moon we'd have a different orbit of the sun so different conditions.
Wind can cause currents.And I am pretty sure that oxygenation happens at the surface mostly (you know, at the air/water interface.)
The sea would still have a surface!!!!
The med is hardly tidal at all and manages to sustain plenty of life.
Timmy40 said:
I found out a very good answer to something, to work out how long a battery will power an electrical device for you multiply the AH by 10 then divide that by the wattage of the device, and the result is how many hours you can run the device for.
Just - no.1kW kettle attached to a 1,000Ah battery.
10 hours according to your math.
Completely ignoring the voltage of the battery which of course determines how much power is actually stored in the batttery.
walm said:
Timmy40 said:
I found out a very good answer to something, to work out how long a battery will power an electrical device for you multiply the AH by 10 then divide that by the wattage of the device, and the result is how many hours you can run the device for.
Just - no.1kW kettle attached to a 1,000Ah battery.
10 hours according to your math.
Completely ignoring the voltage of the battery which of course determines how much power is actually stored in the batttery.
Timmy40 said:
walm said:
Timmy40 said:
I found out a very good answer to something, to work out how long a battery will power an electrical device for you multiply the AH by 10 then divide that by the wattage of the device, and the result is how many hours you can run the device for.
Just - no.1kW kettle attached to a 1,000Ah battery.
10 hours according to your math.
Completely ignoring the voltage of the battery which of course determines how much power is actually stored in the batttery.
And if I have a 24v battery? Or 1.5v?
walm said:
Timmy40 said:
walm said:
Timmy40 said:
I found out a very good answer to something, to work out how long a battery will power an electrical device for you multiply the AH by 10 then divide that by the wattage of the device, and the result is how many hours you can run the device for.
Just - no.1kW kettle attached to a 1,000Ah battery.
10 hours according to your math.
Completely ignoring the voltage of the battery which of course determines how much power is actually stored in the batttery.
And if I have a 24v battery? Or 1.5v?
Timmy40 said:
Then for a 24V battery assuming you have a suitable inverter I assume it's 24 * the AH divided by the wattage. To be honest I've only see 12V inverters to allow a 3 pin plugged device to run off a car batter anyway. Which is what most people would want to do.
OK - perhaps I jumped the gun.Your rule of thumb will clearly work well for the most common use.
I don't know the wattage of my smoke detectors anyway and those duracells didn't have an Ah rating after all!
walm said:
Timmy40 said:
Then for a 24V battery assuming you have a suitable inverter I assume it's 24 * the AH divided by the wattage. To be honest I've only see 12V inverters to allow a 3 pin plugged device to run off a car batter anyway. Which is what most people would want to do.
OK - perhaps I jumped the gun.Your rule of thumb will clearly work well for the most common use.
I don't know the wattage of my smoke detectors anyway and those duracells didn't have an Ah rating after all!
It's just a rule of thumb I thought was handy, I've got a 1000W inverter with a 3 pin and there are various things over summer I fancy running off a car battery, so handy to have an easy way to estimate how long things will run for.
Negative Creep said:
I stand to be corrected, but the way I understand it fewer means "not as many" whereas "less" means "not as much" i.e. something that cannot be counted. So why do we say "less than 10 minutes" or "less than a week away". Shouldn't it be fewer?
Fewer for things you would count as individuals, I think. So fewer people, less minutes.Negative Creep said:
I stand to be corrected, but the way I understand it fewer means "not as many" whereas "less" means "not as much" i.e. something that cannot be counted. So why do we say "less than 10 minutes" or "less than a week away". Shouldn't it be fewer?
Fewer is for discrete numbers of items. 'Less than 10 minutes' is a measurement of continuous time, involving maybe fractions of a minute, seconds, etc and it is not simply a measurement of the number of minutes involved.
'less than a week away' is the same.
Ayahuasca said:
History question.
Why did Henry VIII not have his first wife, Catherine of Aragon, offed?
He had no qualms about offing later wives, and offing Catherine would have saved years of hassle and bother of breaking away from the pope and setting up his own branch of the church.
Was he more squeamish in his early days?
Didn't he have a riding accident which left him a changed man, he was a much nicer person in his early years than his later ones.Why did Henry VIII not have his first wife, Catherine of Aragon, offed?
He had no qualms about offing later wives, and offing Catherine would have saved years of hassle and bother of breaking away from the pope and setting up his own branch of the church.
Was he more squeamish in his early days?
Why is it when setting out on a motorbike ride that a single large insect will splat your visor right in front of the viewing area within seconds of the journey, then no more will hit that piece of visor until you have cleaned it off?
Whereupon another will land in the same spot within a mile and the process repeats, ditto for newly polished car windscreens.
Whereupon another will land in the same spot within a mile and the process repeats, ditto for newly polished car windscreens.
deeen said:
Dr Jekyll said:
Why does the tilting of the earths axis that causes the seasons take exactly the same time to repeat itself as the earth takes to go round the sun?
The "tilt" doesn't move or change, it's the fact that we orbit the sun while tilted that causes the seasons. I think.Gassing Station | The Lounge | Top of Page | What's New | My Stuff