If electrical energy costs 12 cents, or so.12, per kilowatt-hour, then what woul
ID: 1879523 • Letter: I
Question
If electrical energy costs 12 cents, or so.12, per kilowatt-hour, then what would the following events cost? (a) burning a 40 W light bulb for 24 h straight (b) operating an electric oven for 4.0 h if it carries a current of 20.0 A at 220 V Need Help? taik tTter The potential difference across a resting neuron in the human body is about 100.0 mV and carries a current of about 1.970 mA. How much power does the neuron release pw Need Help? o e 11. -9.1 points States; $0.120/kwh is a typical value. At this unit price, calculate the cost that would result from each of the folliowing The cost of electricity varies widely throughout the United (a) leeving a 80.o w porch light on for 2 weeks while you are on vacation (b) Making a piece of dark toast in 3.00 min with a 390 W toaster a loed of clothes in 40.0 min in a 5200 W dryer Need Help? MMAMel Type here to searchExplanation / Answer
(9)
energy cost = 12 cent/kWH
(a)
burning 40W light bulb for 24 hour
E = 40*24
E = 960 W = 0.96 kW
cost = 0.96*0.12
cost = $0.1152
(b)
operating oven for 4 hour
Power = I*V = 20*220
P = 4400 W
E = 4400*4
E = 17600 W = 17.6 kW
cost = 17.6*0.12
cost = $2.112
------------------------------------------------------------
(10)
Power = V*I
P (Watts) = (100 x 10-3)*(1.970 x 10-3)
P = 197 x 10-6 W
P = 197 µW
------------------------------------------------------------
(11)
cost of electricity = $0.120/kWh
(a)
80W porch light for 2 weeks(336 hours)
E = 80*336
E = 26880 W = 26.88 kW
cost = 26.88*0.12
cost = $3.2256
(b)
using 890W toaster for 3 min
E = 890*0.05
E = 44.5 W = 0.0445 kW
cost = 0.0445*0.12
cost = $0.00534
(c)
using 5200W dryer for 40 min(0.6666 hours)
E = 5200*0.666
E = 3466.66 W = 3.4666 kW
cost = 3.4666*0.12
cost = $0.416
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.