Answer:
1) 0.1875 kWhr
2) $5.475
Explanation:
1) To convert 750 Watt to kWhr, firts we convert watt to kilowatt
750 W in kW =
kW
To calculate the amount of power used in kWhr, we multiply the power rating (0.75 kW) by the number of time spent in hours (15 mins).
To convert 15 mins to hour,
15 mins in hr =
hr
The kWhr used = 0.75 x 0.25 = 0.1875 kWhr
2) If used 15 mins everyday for a year, first we calculate the total amount of power used for 365 days
Daily usage at 15 mins = 0.1875 kWhr
Yearly usage = 0.1875 x 365 = 68.4375 kWhr
Cost of usage for a year at 8 cents per kWhr is;
68.4375 x 8 = 547.5 cents
Cost of usage = $5.475 per year