5. How many Joules of energy is in one kilowatt hour? Our classroom has about 20 lights, each with 50 W power rating. How many hours could a generator operating at 100% efficiency supply this power from one gallon of gasoline? If the generator operated at a realistic efficiency of 20%?

Q: A 2 kg toy car can drive at a constant speed of 20 km/hr, please: a. Calculate the kinetic energy at…

A: Given value--- Mass = 2 kg . speed = 20 km/h. We have to find--- kinetic energy? if voltage = 12…

Q: 22. Two objects, A and B, are placed in thermal contact. The entropy of object A decreases. What can…

A: 22.As the two objects are in thermat contact therfore their temperatures must be samec. TA=TB…

Q: Every day a certain household uses a 3,3 kW electric stove for 72 minutes, six 6 hours each and…

A: Every day a certain household uses a 3.3 KW electric stove for 72 minutes,  six 100 W light bulbs…

Q: In a certain city, electricity costs $0.12 per kW · h. What is the annual cost for electricity to…

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Q: appliances: (i) Three Air Conditioner of rating 2000 W for ten hours each day (ii) Two Electric…

A: Given that    Cost of unit electricity = 20 Bz / kwh  electric appliance  3 AC X 2000W X 10 hr = 60…

Q: Compare the energy consumption of two commonly used items in the household. Calculate the energy…

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Q: 5. A person used his 1500 W air-conditioning unit for 6 h every day during the month of July. a. How…

A: Given Power of AC = P = 1500 W Daily used time = t = 6 h Electricity cost = P9.45/kWh We have to…

Q: How long in minutes will it take a 1-kW. 230-volt percolator to raise the temperature of 1.8 kg of…

A: Power of percolator: P = 1000 Watts Mass of water: m = 1.8 kg  Initial temperature of water: Ti =…

Q: The cost of electricity in Saskatoon is currently about 16.35 cents/kWh (including carbon tax). At…

A: Given data: Cost of electricity = 16.35 cents/kWh Power (P) = 80.0 W Time (t) = 2 weeks

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

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Q: An incandescent lightbulb is an inexpensive but highly inefficient device that converts electrical…

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Q: Question 7: Certain areas in Arizona, Nevada, California and Texas can have up to 4000 sunny hours a…

A: From the given data we can say Total energy consumption = Average light landing * Sunny hours *…

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

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Q: In a certain city, electricity costs $0.17 per kW h. What is the annual cost for electricity to…

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Q: A compact fluorescent lamp (CFL) uses less energy than its equivalent incandescent bulb. How much…

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Q: Alfredo deDarke sleeps with a 7.5-Watt night light bulb on. He turns it on before getting in bed and…

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Q: What is the useful energy output when a 60 W light bulb is on for 2 hours? Recall, traditional light…

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Q: Suppose a heart defibrillator consumes 425 j of energy in 10.5 ms. What is the average power output…

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Q: Calculate the cost of leaving 1300 W refrigerator for a year, if the electric company charges you 12…

A: Write the formula for the total amount of power used in a year. Ptotal=watts×hours used per day×days…

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 11.6 W energy efficient fluorescent light bulb is designed to produce the same illumination as a…

A: The energy is a scalar quantity , which represents the ability to do a certain work or process . The…

Q: light bulb uses up a power of 2.6 kW/hr. If the rate is Php153.42 per 1 kW/hr, and the light was on…

A: Power is the rate of work done. Power = work done / time P = W/t =   W - work done t - time in…

Q: In a household, a 120-W personal computer (PC) is run for 4 h/day, while a 60-W bulb runs for 8…

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Q: A solar panel of length L and width W produces 28.4 kWh in a day. Under the same conditions (i.e.…

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Q: A clothes dryer uses 3,000 watts when the motor is running. A newer model uses 400 watts when the…

A: Given The power of the old cloth dryer is Po=3000 W=3000×10-3 =3 kW. The power of the new model of…

Q: A stationery shop use the following electric appliances: (i) Four Air Conditioner of rating 1900 W…

A: Electrical energy consumed by air-conditioners, for the month-E1=No. of air-conditioner×Rating of…

Q: Kabir bought 5 new light bulbs of 50 W each in addition to the 7 bulbs he already had in his house…

A: C

Q: You and your housemate have an argument over the cost of the electric bill. You want to turn off the…

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Q: Calculate the number of kilowatt-hours (kW-hrs) consumed in a week by two 60-Watt incandescent light…

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Q: The cost of electricity in Saskatoon is currently about 16.35 cents/kWh (including carbon tax). At…

A: Given Data Cost of electricity is given as 16.35 cemts/kWh Power of the porch light is Pl=80.0 W…

Q: The energy contents, unit costs, and typical conversion efficiencies of various energy sources for…

A: The unit cost of each energy source for water heaters can be given by the equation, Now, for…

Q: Physics What is the total cost of using all of the following at 9¢ per kilowatt-hour? (i) A 1200-W…

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Q: A small wind turbine has 3 blades that are 1m radius each. Take the air density on a typical day to…

A: A turbine is a device that converts fluid rotational energy captured by a rotor system into useful…

Q: An iPhone battery stores 6.55 Wh of energy. How many iPhones could be charged in one day by a small…

A: Energy recieved by solar panel = total energy × area

Q: You cook your meal at 350 F for 60 mins. This uses about 2.5kWh of electricity. What will it cost…

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Q: A person used his 1500 W air-conditioning unit for 5 h every day during the month of June. How much…

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Q: A small vegetable shop use the following electric appliances: ) Two Air Conditioner of rating 1800 W…

A: Given that the two air conditioner are of 1800 W and they work for 10 hours each day  Therefore…

Q: Problem 2: A large household air conditioner may consume 15.5 kW of power during normal operation.…

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Q: In recent years, practical hybrid cars have hit the road—cars in which the gasoline engine runs a…

A: Given: The input voltage is 220 V. The input current is 100 A. The output voltage is 400 V.

Q: Suppose a battery operates a 2.25 W electric clock for 19.5 months. 1. What is the available energy…

A: Suppose a battery operates a 2.25 W electric clock for 19.5 months. 1. What is the available energy…

Q: How much energy (in units of kWh) does a 824-W electric motor use in 29 hours of operation? O a.…

A: Given : Power of motor, P = 824 W Time, t = 29 hrs.