Formulae

[brianwaring]

What are the formulas regarding volts watts amps and bt'us

[rja211077]

what are bt'us?

[rekstout]

BTU is british thermal unit - a unit of heat energy.

I remember from physics that W=V x I where Power is W (in Watts), V is voltage in Volts and I is current in amps. Likewise V=IR where R is Resistance in Ohms. Not sure about BTUs formulae though

[Dsg]

The simple formula (Ohm's Law) is that Watts=VoltagexCurrent(Amps). A Watt is a unit of power and is equivalent to one Joule per second . A Joule is a unit of Work defined as the work performed by applying a constant force of one Newton to an object and moving it one metre. A Newton is the force required to give a mass of 1kg an acceleration of 1metre/second/second . Clear so far ? Good, then to convert Watts to BTU's per hour all you do is multiply the number of Watts by a constant of 3.41. A BTU is the amount of energy necessary to raise the temperature of 1lb of water from 58.5 degrees Fahrenheit to 59.5 degrees. Good Luck

[Gef]

Good answers so far. Just to add for the metrically minded that 1 joule is the energy needed to raise the temperature of 1kg (1000g) of water by one degree.

[brianwaring]

is a joule a metric or imperial measurement.One of you must be wrong . Because ther is no direct correlation between a pint and a litre

[Andromeda]

Brian,

Technically a joule is a International Standard (SI) unit. But you can call it metric. And there is a direct correlation between a pint and a litre: there are 1.760 pints in a litre. The definition of a joule (newton metre) is as DSG said. The definition of a calorie is the amount of energy required to to raise one gram of pure water 1 degree celsius (from 14.5C to 15.5C exactly). As there are 4.184 calories in a joule Gef's answer is not completely correct, but fairly near. Sorry to be picky.

Andy

[Gef]

Andromeda is not being picky - I just typed joule instead of calorie so my answer was nonsense. However, please remember that the calories quoted on food packaging are actually kilocalories or Calories.