Question

Number of joules in 1 kWh is

• A. 3.6 $\times$ ${10}^7$
• B. 3.6 $\times$ ${10}^6$
• C. 3.6 $\times$ ${10}^5$
• D. 3.6 $\times$ ${10}^4$

Answer 1

The correct option is B

3.6 $\times$ ${10}^6$

Given:
1 kWh = 1000 watt $\times$ 1h or (60 $\times$ 60) = 3600 seconds
= 3600000 watt second

= 3.6 $\times$ ${10}^6$ watt second

= 3.6 $\times$ ${10}^6$ joule (J)
The number of joules in 1 kWh is 3.6 $\times$ ${10}^6$