Question

what is the commercial unit of electrical energy ​

Answer 1

✍️ Kilowatt-hour is the commercial unit of electrical energy. The other name used for it is units. Here J represents Joules and h represents hour and s represents seconds....

Answer 2

SI unit of commercial unit of electric energy = kilo-watt hour.

It is defined as the electric energy consumed when an electric appliance of power 1KW works for 1 hour.

i.e.,

$\large\sf{1KWh=1KW×1h}$

$\large\sf{100W×3600s}$

$\large\sf{1000\frac{J}{s}×3600s}$

$\large\sf{1KWh=3.6×{10}^{6}Joules}$

Let us consider three resistors R1, R2, R3 connected in parallel & then we can write

I = I1 + I2 + I3 ..............(1)

A/C to ohm's law,

I = V/R

I1 = V/R1

I2 = V/R2

I3 = V/R3

Putting all these values in eq (1),

we get,

$\large\sf{\frac{V}{R}=\frac{V}{R1}+\frac{V}{R2}+\frac{V}{R3}}$

$\large\sf{V( \frac{1}{R} ) = V( \frac{1}{R1 } + \frac{1}{R2} + \frac{1}{R3} )}$

$\large\sf{\frac{1}{R} = \frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3}}$

$\large\sf{ \frac{1}{Req} = \frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3}}$