Question

7. Derive the relationship between SI Unit of electrical energy and commercial
unit of electrical energy.
​

Answer 1

Answer :

• SI unit of electrical energy is kilowatt -hour
• SI unit of electrical energy is joule

Relation Between Kilowatt - Hour and joule :

1 kilo watt Hour = 1 Kilowatt × 1 Hour

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= 1000 watt × 60 min

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= 1000 watt × 60 × 60 s

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= 1000 watt × 3600 sec

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= 3600,000 watt second

$\large\underline{ \boxed{ \tt \: 1Kwh = 3.6 × 10 {}^{6} J}}$

$\quad \tt \: 1 \: unit = \frac{watt \times h \times day}{1000}$

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