A household\'s electric bill is shown below. Use this electric bill to answer th
ID: 1344426 • Letter: A
Question
A household's electric bill is shown below. Use this electric bill to answer the following questions except for D. For D you'll need to actually go around your home and count up the total wattage of all the light bulbs you are using.
Service From: SEP 15 to OCT 19 (34 days)
PREVIOUS BILL AMOUNT
PAYMENTS
(-)
NEW CHARGES (+)
ADJUSTMENTS (+ OR -)
AMOUNT DUE (=)
$161.78
$161.78
$308.77
$42.58
$351.35
PREVIOUS METER READING
PRESENT METER READING
TOTAL USAGE
RESIDENTIAL SERVICE
SALES TAX (3%)
NEW CHARGES
66474 kWh
69670 kWh
3196 kWh
$299.78
$8.99
$308.77
What is the cost per kWh? Do not include taxes nor other fees.
$/kWh
¢/kWh
What was this household's average power consumption? Express your answer in both W and kW.
W
Kw
The electric company has seen to it that each home is provided with roughly 120 V at each electrical outlet (there are a few that are 240 V but we'll ignore those). Using this fact and your previous answer (the power in W) determine the average current that was running through this house.
Amps
PREVIOUS BILL AMOUNT
PAYMENTS
(-)
NEW CHARGES (+)
ADJUSTMENTS (+ OR -)
AMOUNT DUE (=)
$161.78
$161.78
$308.77
$42.58
$351.35
Explanation / Answer
1)
Total charge = $308.77
Total usage = 3196 KWh
Cost per KWh = 308.77 / 3196 = $0.097
Answer:
$0.097 / kwh
or cent 9.7/Kwh
2)
Service From: SEP 15 to OCT 19 (34 days)
number of hour = 39*24 = 936 h
total usage = 3196 kwh in 936 h
in 1 h usage is 3196/936 = 3.415 kwh
in 1 sec it will be 3.415 kw
average power consumption = 3.415 kw or 3415 w
3)
P = V*i
3415 = 120*I
I=28.5 A
Answer: 28.5 A
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