5. An electric heater has a power rating of 1500 watts (1.5 kW). If the heater is run for 6 hours, and electricity costs Php 12 per kWh, how much will it cost to run the heater for this time interval?

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

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?

Suppose you use 60 kWh (kilowatt hours) of electricity at $0.31 per kWH, 96 kWh at $0.27 per kWh, and 87 kWH at $0.22 per kWh. What is your total kHW of electricity used?

A 400-W computer (computer plus monitor) is turned on 8.0 hours per day. If electricity costs ₱ 9.0 per kWh, how much does it cost (in ₱) to run the computer annually?

The cost of electricity in Los Angeles is 5 cents per 1,000,000 joules. Suppose a small 2000-watt air conditioning unit is operated continuously for 3 hours. What is the cost (in dollars) of the total energy consumed?

The cost to operate a clothes dryer for a year is $80.25. If the rate for electrical energy is 8.8¢/kWh, and the clothes  dryer is used for 700 hours in a year, what is the power rating of the clothes dryer? Explain in depth and clearly using this formula.

The cost of electricity varies widely throughout the United States; $0.120/kWh is a typical value. At this unit price, calculate the cost of the following. (a) Leaving a 60.0-W porch light on for 2 weeks while you are on vacation. $ ________ (b) Making a piece of dark toast in 3.00 min with a 870-W toaster. (Give your answer to at least three decimal places.) __________ ¢ (c) Drying a load of clothes in 40.0 min in a 5,300 W dryer. (Give your answer to at least one decimal place.)  __________¢

Chapter 20: Problem 9: An electric water heater consumes 4.5 kW for 2.2 h per day. a) What is the cost (in $) of running it for one year if electricity costs 13 cents/kWh?

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 = ______