A current of 2 A flows for 10 hours through a 100 ohm resistor. The energy consumed by the resistor will be

Correct option is B

​$$\text{When a current } I \text{ flows through a resistor } R, \text{ the power dissipated across the resistor is} \\P = I^2 R\\[1.5ex]\text{Given that, current } (I) = 2\, \text{A} \\\text{Resistor } (R) = 100\, \Omega \\\text{Time } (t) = 10\, \text{hours}\\[1.5ex]\text{For time } t, \text{ the energy consumed by the resistor is,} \\\text{Energy consumed } (E) = Pt = I^2 R t = 2^2 \times 100 \times 10 = 4\, \text{kWh}$$​​