Question 12 Marks
What is the commercial unit of electrical energy? Represent it in terms of joules.
Answer
View full question & answer→solution The commercial unit of electrical energy is kilowatt hour.
$1 kWh=11000 Wh$
$1000 Wh=(1000 \text { Joule } / \text { second }) \times \text { hour }$
$=1000 \times \frac{J}{S} \times 60 \times 60 s$
$=3600 \times 1000 J$
$=3.6 \times 10^6 J$
$1 kWh=11000 Wh$
$1000 Wh=(1000 \text { Joule } / \text { second }) \times \text { hour }$
$=1000 \times \frac{J}{S} \times 60 \times 60 s$
$=3600 \times 1000 J$
$=3.6 \times 10^6 J$
