A) 15 unit
B) 60unit
C) 120 unit
D) 240 unit
Correct Answer: B
Solution :
Key Idea: The rate at which electrical energy (W) 15 dissipated into other form of energy is called electric power (P) Power = rate of electrical energy \[=0.002cm\] \[K=\frac{1}{2}m{{v}^{2}}\] \[p=\sqrt{2m\,K}\] \[{{m}_{1}}=1g,\,{{m}_{2}}=9g,\,{{K}_{1}}={{K}_{2}}=K\] Also 1 kWh or 1 unit is the quantity of electric energy which is dissipated in 1 h in a circuit when the electric power in the circuit is 1 kWh. \[\therefore \]Energy consumed in 30 days \[\frac{{{p}_{1}}}{{{p}_{2}}}=\frac{\sqrt{2\times 1\times K}}{\sqrt{2\times 9\times K}}=\frac{1}{3}\]
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