A lightweight electric car is powered by a series combination of ten 12.0-V batteries, each having negligible internal resistance. Each battery can deliver a charge of 142 A · h before needing to be recharged. At a speed of 84 km/h, the average frictional force due to air drag and rolling friction is 1.22 kN. (a) What must be the minimum power delivered by the electric motor if the car is to travel at a speed of 84 km/h? kw (b) What is the total charge, in coulombs, that can be delivered by the series combination of ten batteries before recharging is required? kC (c) What is the total electrical energy delivered by the 10 batteries before recharging? MJ (d) How far can the car travel (at 84 km/h) before the batteries must be recharged? km (e) What is the cost per kilometer if the cost of recharging the batteries is 9 cents per kilowatt-hour? $/km

A hair dryer is rated at 1200 W. One average, it is used for 400 minutes every month. The rate for electrical energy is8.8¢/kWh. What is the cost of electrical energy necessary to run the hair dryer for a month?

You get home from work and make the same meal everyday for a year. Vegetables and meat baked in a casserole dish. You cook your meal at 350 F for 60 mins. This uses about 2.5kWh of electricity. What will it cost you to cook your dinners for a year if your utility charges you 5.5 cents per kWh?

A hair dryer is rated at 1850 W. Assuming there are 30 days in a month, what is the monthly cost of using the hair dryer for an average of 12 minutes every day if you are charged 20 cents for every kW-h? $ 222

A stationery shop use the following electric appliances: (i) Four Air Conditioner of rating 1900 W for twelve hours each day (ii) Two Electric Freezer of rating 1500W each for 24 hours each day (iii) Ten electric tube lights of rating 20W each for 12 hours each day. Calculate the electricity bill of the stationery shop for the month of November 2020 if the cost per unit of electric energy is 15 Bz/ kWh. (i) Electrical Energy(in kWh) consumed by four Air conditioners of rating 1900 W for 12 h of each day= (ii) Electrical Energy(in kWh) consumed by two Electric Freezers of rating 1500 W for 24 h of each day= (iii) Electrical Energy(in kWh) consumed by ten Tube lights of rating 20 W for 12 h of each day = (iv) Total energy(in kWh) consumed in the month November'2020 = (V) Electricity bill(in riyals) for the month of November'202 =

A 22.0 V battery moves 7.6 KC of charge. How much energy does the battery deliver? A 2.9x10-³J B 3.5 x 10² J C 1.7 x 105 J D 1.4 x 10¹¹ J

An alpha particle, which has charge 3.20 ✕ 10−19 C, is moved from point A, where the electric potential is 2.60 ✕ 103 J/C, to point B, where the electric potential is 4.90 ✕ 103 J/C. Calculate the work in electron volts done by the electric field on the alpha particle. Answer expressed in eV.

In a typical mammalian cell, the net transport by the sodiumpotassium exchange pump that maintains the 70 mV membrane potential is 500 singly charged ions per second. How much work does the pump do each second?

Problem 20:   Suppose you have a 1100 W toaster. Part (a)  How much electrical energy in J is needed to make a slice of toast (cooking time = 1 minute)?  E = ______ Part (b)  At 10.5 cents/kWh, how many cents does this cost?  cost = ______

Consider a building whose annual air-conditioning load is estimated to be 40,000 kWh in an area where the unit cost of electricity is $0.10/kWh. Two air conditioners are considered for the building. Air conditioner A has a seasonal average COP of 2.3 and costs $5500 to purchase and install. Air conditioner B has a seasonal average COP of 3.6 and costs $7000 to purchase and install. All else being equal, determine which air conditioner is a better buy.