Question

An electric kettle draws a current of 4 A for 2.5 min. If the resistance of its element is 100 Ω, calculate the electric energy drawn by the kettle in kilojoules.

Answer 1

I = 4 A; R = 100 Ω; t = 2.5 min = 150 s

∴ Energy released = I² × R × t

= (4)² × 100 × 150

= 240000 J

= 240 kJ