1 kilowatt hour is the amount of electric energy consumed when 1 kilowatt power is used for 1 hour in an electric circuit. Express it in joules._x005F_x000D_

• A. 6.3 x 106 J
• B. 6.3 x 105 J
• C. 3.6 x 106 J
• D. 4.6 x 106 J