Question

answer please .........​

Answer 1

$I = 15 A \\ V = 220V \\ t = 30\: minutes \: everyday \: for \: 15 \: days \\ \Rightarrow \qquad t = \frac{30}{60} \times 15 = 7.5 hrs \\ \\ \boxed{P=VI} \\ \\ \Rightarrow \qquad P = 220 \times 15 \\ \\ \Rightarrow \qquad P = 3300 Watt \; or \; 3.3 \: kW \\ \\ \boxed{E=P\times t} \\ \\ \Rightarrow \qquad E = 3.3 \times 7.5 \\ \\ \Rightarrow \qquad E = 24.75 \: kWh \\ \\ \Rightarrow \qquad Price \: of \: 1 \: kWh \: or \: 1 \: unit \: is \: Rs. 2 \\ \\ \Rightarrow \qquad Total \: Cost = E \times price \\ \\ \Rightarrow \qquad Cost = 24.75 \times 2 \\ \\ \Rightarrow \qquad Cost = \red{\bold{Rs. \; 49.5} }$