An 8.0 Ω resistor is connected to 20 V.

Question

a. Find I

b. Find how much energy is transformed in 12 minutes

Answer 1

a. I = e / r = 20 v / 8 Ω = 2.5 A

b. power = E I = 20 V * 2.5 A = 50 W

a Watt is a Joule per second ... 50 J/s * 12 min * 60 s/min = 36 kJ