Dncha RENZETTI Figure 20.41 On-demand electric hot water heater. Heat is supplied to water only when needed. (credit: aviddavid, Flickr)

Q: How much does it cost (in P) to operate a 670-W split-type inverter air conditioner for 8 in 30…

A: We have-Power, P= 670 Watt=0.67 KWatt.Time, t= 8 h per dayTotal days= 30Hence, time 't'=30×8h= 240 h

Q: An electric heater is rated 1500 W. How much energy does it use in 10 hours?

A: Given : P = 1500 W = 1.5 kWh T = 10 hours

Q: An electric heater is rated 2.5 kW. how much energy does it use in 12 hours.

A: Given value--- power = 2.5 kW. time = 12 hour. We have to find--- Energy ?

Q: The cost of electricity varies widely throughout the United States; $0.120/kWh is a typical value.…

A:

Q: A hair dryer is rated at 1200 W. One average, it is used for 400 minutes every month. The rate for…

A:

Q: The cost of electricity varies widely throughout the United States; $0.120/kWh is a typical value.…

A: Given, Electricity cost = 0.12$/kWh And power P=Et So, E=P.t a) Power = 40W total time, t =7days=…

Q: How long does it take a 60 W lightbulb to use 4000 Joules of Energy?

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Q: many hours should

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Q: The internal energy of the water in a container is increased by 440 kJ by means of an electric…

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Q: A small vegetable shop use the following electric appliances: () Two Air Conditioner of rating 1700…

A:

Q: A typical cost for electric power is $ 0.135 per kilowatt-hour. (a) Some people leave their porch…

A: Solution

Q: A refrigerator using 1030 W runs two-thirds of the time. How much does the electricity cost to run…

A: A refrigerator using 1030 W runs two-thirds of the time. How much does the electricity cost to run…

Q: An electric heater is rated 1500 W. How much energy does it use in 10 hours?

A: We know thatE=P×tHereE=EnergyP=Powert=Time

Q: A small vegetable shop use the following electric appliances: (1) Two Air Conditioner of rating 2400…

A:

Q: The cost of electricity varies widely throughout the United States; $0.120/kWh is a typical value.…

A:

Q: How much does it cost (in P) to operate a 670-W split-type inverter air conditioner for 8 in 30…

A: We have-Power, P= 670 Watt=0.67 KWatt.Time, t= 8 h per dayTotal days= 30Hence, time 't'=30×8h= 240 h

Q: A refrigerator using 1020 W runs one-third of the time. How much does the electricity cost to run…

A: The total time run by refrigerator ist=1330 days24 h=240 h

Q: An older electric water heater uses 10.0 of power while it's on, but it's only on for 2 hours every…

A:

Q: A battery with an emf of 21 V delivers a constant current of 3.7 mA to a device. How much work does…

A: (given) Battery voltage (V) = 21 V               Current (I) = 3.7 mA…

Q: Energy c o s t s $ 0.053/kWAh. A toaster, rated at1.0 kWAh, is used for a total of 30 minutes per…

A: The kilowatt-hour (kWh) is the unit of energy equivalent to 1 kilowatt (kW) of power expended for 1…

Q: A hoist is used to lift 10 tons of load @ a height of 12 meters in one minute. (a) What is the power…

A: The required mass to be lifted is 10 tons. 10 tons=10000 kg. This mass is to be lifted 12 meters in…

Q: A monthly éléčtřić bill iš based or ge. • A set of electronic devices that altogether are rated at…

A:

Q: A small vegetable shop use the following electric appliances: (i) Two Air Conditioner of rating 1700…

A:

Q: A utility company charges 8.5 cents/kWh. If a consumer operates a 40-W light bulb continuously for…

A: A utility company charges 8.5 cents/KWh.   if a consumer operates a 40-W bulb continuously  for one…

Q: pacity of 2.44 joules per gram kelvin and a specific gravity of 0.7893. Assume the initial…

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Q: A battery with an emf of 26 V delivers a constant current of 4.3 mA to a device. How much work does…

A: Given Data:Emf of battery E = 26 VCurrent I = 4.3 mA = 4.3×10-3 ATime t = 5 minutes = 5 ×60 st = 300…

Q: A hair dryer is rated at 1850 W. Assuming there are 30 days in a month, what is the monthly cost of…

A: Given data:  Power (P) = 1850 W = 1.850 kW Daily uses = 12 minutes = 0.2 hours Number of days in a…

Q: A 100-W light bulb is left on for 10.0 hours. Over this period of time, how much energy was used by…

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Q: ne 9-volt battery contains 19.7 thousand joules of energy.  A 4-pack of 9-volt batteries cost $10.31…

A: The energy in one battery E =19.7×103 J Total energy of 4 pack 9V battery is 4E The power is 1 Watt…

Q: A typical cost for electrical power is $0.120 per kilowatthour Suppose your refrigerator uses 400 W…

A: Let the power rating of the refrigerator be P and the cost of the electrical energy per…

Q: A typical cost for electrical power is $0.120 per kilowatthour. Some people leave their porch light…

A: Given data P=75 WC=$ 0.12 /kWh