# Voltage Vs. Current In A Laptop Battery? - Page 2

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## Re: Voltage Vs. Current In A Laptop Battery?

Thank you :-)

The definition of 1 watt (W) = 1 joule per second (J/s).

It is also equal to V.A (i.e the scalar product of potential difference and
current, so VA only when the phase angle is zero) and equal to kg.m^2.s^-3.

## Re: Voltage Vs. Current In A Laptop Battery?

On Sun, 08 Apr 2012 18:23:39 +0100, "Anthony R. Gold"

<quote>
Watt definition

Watt is the unit of power (symbol: W).

The watt unit is named after James Watt, the inventor of the steam
engine.

One watt is defined as the energy consumption rate of one joule per
second.

1W = 1J / 1s

One watt is also defined as the current flow of one ampere with voltage
of one volt.

1W = 1V × 1A
</quote>

source:
http://www.rapidtables.com/electric/watt.htm#definition

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## Re: Voltage Vs. Current In A Laptop Battery?

Whoa there, two different definitions for one SI unit? That is unbelievable
(in the literal sense of that word)!

Thanks, but WTF are rapidtables and what is their authority to define
anything?

A derived SI unit is formally defined in terms of SI base units and the
definition of the watt is kg.m^2.s^-3.

Ref:
http://physics.nist.gov/cuu/pdf/sp811.pdf
http://physics.nist.gov/cuu/Units/units.html
http://www.french-metrology.com/en/si/units-measurement.asp#derivees

For an explanation of the difference between VA and V.A (i.e. between the
product of their magnitudes and their scalar product) try: