Jenny is out trimming her hedges with a hedgetrimmer that has a 1500W power rating. If it takes her a half hour to finish her chores and the cost of electricity is 12cents/kWh, how much will it cost to make the front of her house beautiful?

Q: Calculate the total WORK performed by a generator that is uses 355 Watts of power for 5 seconds? *…

A: Write the expression for the work. Here, P represents the power and t represents the time.

Q: A water jet consumes 450 W for 24 hours a day. What is the energy cost savings for this period if…

A:

Q: The unit kilowatt-hour is a measure of(a) the rate at which energy is transformed.(b) power.(c) an…

A: kilowatt hour

Q: Suppose you have a clothes dryer that uses 4000 watts of power and you run it for an average of 1…

A: Given data: Power of clothes dryer, P=4000 W

Q: A laptop computer uses 75W of power in one hour. Electricity costs 5.6¢ /kW-h. Calculate how much it…

A:

Q: What power output is required of a motor that needs to lift a 450 kg elevator car 12 meters in 8.0…

A:

Q: lee watches tv for 2 hours per day. During that time, the TV consumes 200 watts per hour.…

A: Given, TV consumes 200 watts in 1 hour Lee watches tv for 2 hours 1 kilo watt hour energy costs = 18…

Q: A washing machine has a power requirement of 2500 W. Every month the machine is used for 6.0 hours.…

A: power requirement of washing machine = 2500 Wtime = 6 hours cost of electricity = 13 cents/kWh

Q: A 60W light bulb is used 12 hours a day and is 30% efficient. How many kJ are used to power this…

A:

Q: How much electric energy is delivered to a 60 W lightbulb if the bulb is left on for 2.5 hours?

A: Write the given values with the suitable variables. P=60 Wt=2.5 hr=2.5×3600 s=9000 s Here, P is the…

Q: What is the speed of electricity?

A: The word electricity  generally refers to the movement of free electron within conductor in presence…

Q: A lamp consumes 1000 J of electrical energy in 10 s. What is its power? L00

A:

Q: Which formula represents the law of conservation of energy?

A: SOlution: Which farmula corrrectly represents the conservation of mechanical energy.

Q: What is the power of a light bulb if it uses 120J of energy in 4.0 seconds? Your answer: O 0.033 W O…

A: Given data : Energy used by light bulb, Time taken,

Q: A school is paying $0.12/kWh for electric power. To reduce its power bill,the school installs a wind…

A: Power generated per year

Q: 13. Which is not a unit of energy? O Newton O Joules O Ergs O kilowatt - hr

A: Newton is unit of force Joules  is unit of energy  SI unit Erg is unit of energy in cgs unit…

Q: How much energy is used in 20 minutes of listening to music on an mp3 player that uses 9 watts of…

A:

Q: 27. How much power is required to do 18O J of work in 2.4 s?* O 432 J O 432 W O 75 J O 75 W

A:

Q: If a blow dryer uses 1.1 x 10³ J of energy, and it is in use for 15 minutes, what is its power? the…

A: Given, energy consumed E=1.1x103W

Q: 93. How much power is required to do 180 J in 2.4s? . O a. 178 W O b. 430 W O c. 7.5 W O d. 75 W

A: Given: The energy required is 180 J. The time interval is 2.4 s.

Q: Chichay uses the washing machine which consumes energy at 300 Watts at normal washing speed. How…

A: Given(s): Power of the machine, P=300 W=0.30 kW It runs for, t=80 min=8060h=43 h Cost of…

Q: 10. A 100 MW expressed in powers of 10 is given by: * O 1.0 x 106 W 1.0 x 107 W 1.0 x 108 W 1.0 x…

A: The power in megawatts is given as,

Q: this is a 23 watt energy efficient light bulb (1bulb) which cost 6.00.the retail price of…

A: The energy consumed by a device is given by E = P×t, where P = the power of the device t = time

Q: The unit of Power (P) is

A: We have to answer the unit of Power (P)

Q: Which of these is a unit of power and which is a unit of energy—a watt, a kilowatt, a kilowatt-hour?

A:

Q: Suppose you have a 1000W microwave that you need to run for 5min to heat up your dinner. How much…

A:

Q: Water flows over a section of Niagara Falls at a rate of 1.2 × 10^6 kg/ s and falls 50 m. How many…

A:

Q: A lamp consumes 1200 J of electrical energy in 10 s. What is its power?

A: Answer: Given data, Lamp consumes electrical energy (E)=1200 J Time (t)=10 s

Q: A dog chasing a ball through a field has 7,500 J of kinetic energy. What is the dog's mechanical…

A: Mechanical energy is addition of kinetic energy and potential energy.

Q: A 40 Watts bulb is used for 12.5 hours everyday for 30 days. Calculate the consumption of electrical…

A: Given:Power=40 wtTime = 12.5 hr=12.5 x30 days=375 hours

Q: If a hair dryer is rated at 1750 W, how much energy does it require in 6 minutes

A: Consider the energy consumed by the dryer in hour is, E=Pt Here, P is the power consumed and t is…

Q: in physics, called power is which is difFined as the quantity a

A: Since, it is known that unit of Energy is kg.m2.s-2. Also power is defined as rate of doing work.…

Q: A family of five is planning to install solar panels on the roof of their home to help reduce the…

A: Dewr student The energy rating is given in KiloWatt Hour. As we know the power is rate of doing…

Q: Which one of the following is the unit of energy?

A: the above

Q: A standard computer has a power supply of 550 W, and many people just leave their computer on all…

A:

Q: A clock consumes 1.5 W of electrical power. How much energy does it use in each day?

A: In a day there are 24 hours, therefore, total time (t) in seconds will be,

Q: Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?

A: The expression for energy in terms of power is,

Q: A light bulb has a power of 300W. What is the energy dissipated by it in 5 minutes? Select one: a.…

A:

Q: Lee watches TV for 2 hours per day. During that time, the TV consumes 150 watts per hour.…

A:

Q: Lee watches TV for 4 hours per day. During that time, the TV consumes 200 watts per hour.…

A: Given: The TV takes the time is 4 hours per day. The cost of electricity is 15 cents/kW.h. The total…

Q: A typical desktop personal computer uses around 100 W of power when carrying out intensive…

A: Given : P = 100 W t = 90 minutes = (90)(60) = 5400 seconds

Ohm's law

Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.

Path of Least Resistance

In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.