JAMB - Physics (2018 - No. 84)
A resistor connected to a 12V battery draws a current of 2A. The energy dispatched in the resistor in 5 minutes is ___.
3,600J
6,000J
7,200J
14,400J
คำอธิบาย
Power drawn by the resistor = IV = (2)(3) = 24W = 24J/s
Energy dissipated = power × time = (24)(5)(60) = 7200J