Answer
0.25 dollars
Work Step by Step
To calculate the cost for 5 hours, we first need to calculate the amount of energy spent in these 5 hours. The formula that must be applied for this is,
P=$\frac{E}{T}$
Making E the subject of the formula, E=$P\times T$
Power (P) was calculated in part (a) as 1028.6 W
Time (T) is 5 hours or 18000 seconds
Substituting these values in the formula, E is calculated to be 18514800 J
Now, we need to convert Joules into Kwh,
1 Kwh = $3.6\times10^{6}$ J
So 18514800 J are equal to 5.143 Kwh
Since 1 kwh costs 0.05 dollars,
5.143 kwh cost 0.25 dollars
