You install solar power in your home, and the solar panel costs $500 and is capable of producing 3 Million joules of energy each day. If electrical costs are $0.15/kilowatt hour, a kilowatt is equal to 1000 watts, and there are 3600 joules in 1 watt hour, how long will it take for the solar panel to pay for itself in electrical savings?

Q: The "efficiency" of a light bulb is the ratio of the:

A: Efficiency: Efficiency is the term which means the ration of the output to the input or the ratio of…

Q: Wind farms in Washington have a capacity of 3075 Megawatts (mega means million remember so this is…

A: Power is the total energy per unit time. KWh (Kilo-Watt hour) is the unit of energy.

Q: A certain walking person uses energy at an average rate of 300 All of this energy has its ultimate…

A:

Q: If a microwave oven emits 1,100 J of energy every second, how much energy will be emitted after 8.9…

A: Power emitted by a source is defined as the energy radiated per unit time, given as P=Et In the…

Q: An electric clothes dryer is rated at 2,200 W. How much energy does it use in 45 min?

A: Write the formula for power.

Q: The human body uses 7500 kJ of energy every day. What is the rate of energy consumption per second…

A: Given  Enrgy E=7500kJ

Q: A bakery has a 6,100W oven that runs every day from 5am until 7pm making tasty pastries for the…

A: Given: Power of bakery = 6100 W = 6.1 KW The time of bakery runs per day = 5 am to 7 pm = 14 hours…

Q: ten countries during 2011. (a) Based on the data in the graph, identify one of the fuel sources…

A: A)  From the graph , it is being proved that fossil fuel source has  highest contribution to the…

Q: A microwave has a power requirement of 1,264 W. A frozen dinner required 4.2 mins to heat on full…

A:

Q: A coffee percolator rated at 120 volts, 1,400 watts requires 15 minutes to complete its cycle. How…

A:

Q: A hot water heater in a residential home runs for an average of 3.1 hours per day with a heat energy…

A:

Q: How much does it cost to power a refrigerator for 30 days if it is rated at 200 Watts and the power…

A: Electrical energy (E) use equals the power (P) of the object multiplied by the amount of time (t)…

Q: What is the approximate cost of operating a 65 W light bulb for 3.0 h per day for 1 week, if the…

A: The given values are, P=65 Wthour/day=3.0 h/daytday=1 week=7 daysrate=14 cents/kWh

Q: The average US home uses 50,000,000 Joules of electrical energy per day. How many Joules will…

A:

Q: A microwave oven has a power requirement of 1,243 W. A frozen dinner requires 5.6 min to heat on…

A: The energy consumed by the oven can be obtained as E=Pt=1243W×1kW1000W5.6min×1h60min=0.116kWh

Q: What is the cost of operating a 63-Watt freezer for a month if the cost of electricity is $ 0.02 per…

A:

Q: A 100 watt lightbulb consumes how many joules of energy in 1 second

A:

Q: If your cell phone has a battery that can hold 1124 milliampere-hours of charge, how long will the…

A:

Q: A worker in a company work 7 hours in a day, there are 22 working days in a month other than working…

A: Given: Number of working days in a month = 22; Number of working hours per day = 7; Number of extra…

Q: -lar energy provides the energy for your solar calculator. In order for that to ppen, several energy…

A: Here Light energy coverted and grow plant then animal eats that plant when animals died converted to…

Q: The energy used by a 100 watt light bulb in 1 hour i

A:

Q: How much power does 5.7 watt LED light bulb produce in 60 seconds

A: Given: The power of an LED light bulb is 5.7 watts. Introduction: 1 Watt of power means that the…

Q: Suppose you use 57 kWh (kilowatt hours) of electricity at $0.35 per kWH, 91 kWh at $0.26 per kWh,…

A: We use 57 kWh of electricity at 0.35$ per kWh So cost of 57 kWh of electricity is 57×0.35$=19.95$ We…

Q: What is the cost of operating a 84.87-Watt freezer for a month if the cost of electricity is $ 0.04…

A: We know that power is given by P= E/t Where E- energy            t- time Given P=84.87W…

Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.