Question

define S.I unit of power?

Answer 1

S. I unit of power

By using the formula,

Power = Energy (J) /Time (s)

We get the SI unit of power as joule per second or Js¯¹.

Thus, if one joule of energy is supplied or work is done in one second, then the power is said to be one watt. The SI unit of power is watt named after James Watt, the inventor of steam engine, and is denoted by W'. The SI unit of electrical energy is joule.

"One joule is the amount of electrical energy consumed when an appliance of one watt power is used for one second."

1 W =1 Js¯¹

watt is a small unit of power.

The bigger unit of power is kilowatt and is written as kW.

1 kilowatt = 1000 watt

or 1 kW = 1000W

or 1 kW = 1000 J s¯¹

There is another unit of power called horsepower (H.P.) which is in common use to express the power of engines in a car, scooter, bus etc.

1 horse power = 746 watt

Or 1 H.P. = 746 W

The practical unit of power is horsepower (H.P.)

Answer 2

${ \mathtt{ \underline{ \underline{Answer}}}}$

POWER:-

The rate of doing work is known as Power.

S. I UNIT :-

The SI unit of power is the watt (W),

~ Watt is the unit of power

~ Symbol - W

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

or

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

${ \mathfrak{ \pink{Formula}}}$

$1w = \frac{1j}{1s}$

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${ \mathtt{ \orange{ \boxed{Facts}}}}$

• The watt was adopted as an SI unit in 1960

• The unit watt is given by James Watt

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