Answer:
(a) $ 1.48
(b) $ 0.005
(c) $ 0.38
Explanation:
(a)
First, we calculate the energy consumed, by using following formula:
E = Pt
where,
E = Energy Consumed = ?
P = Power Delivered = (40 W)(1 KW/1000 W) = 0.04 KW
t = Time Duration = (2 weeks)(7 days/week)(24 h/day) = 336 h
Therefore,
E = (0.04 KW)(336 h) = 13.44 KWh
Now, we calculate cost, by following formula:
Cost = (E)(Unit Price)
Cost = (13.44 KWh)($ 0.11/KWh)
<u>Cost = $ 1.48</u>
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(b)
First, we calculate the energy consumed, by using following formula:
E = Pt
where,
E = Energy Consumed = ?
P = Power Delivered = (970 W)(1 KW/1000 W) = 0.97 KW
t = Time Duration = (3 min)(1 h/60 min) = 0.05 h
Therefore,
E = (0.97 KW)(0.05 h) = 0.0485 KWh
Now, we calculate cost, by following formula:
Cost = (E)(Unit Price)
Cost = (0.0485 KWh)($ 0.11/KWh)
<u>Cost = $ 0.005</u>
<u></u>
(c)
First, we calculate the energy consumed, by using following formula:
E = Pt
where,
E = Energy Consumed = ?
P = Power Delivered = (5.203 x 10³ W)(1 KW/1000 W) = 5.203 KW
t = Time Duration = (40 min)(1 h/60 min) = 0.67 h
Therefore,
E = (5.203 KW)(0.67 h) = 3.47 KWh
Now, we calculate cost, by following formula:
Cost = (E)(Unit Price)
Cost = (3.47 KWh)($ 0.11/KWh)
<u>Cost = $ 0.38</u>
