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?

Problem 5:  Suppose you have 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)?  Part (b)  At 11.5 cents/kWh, how many cents does this cost?

One 9-volt battery contains 19.0 thousand joules of energy.  A 4-pack of 9-volt batteries cost $14.40 at Lowe's.   Estimate the cost of battery energy in dollars per kilowatt-hour.  Energy conversions are available in Section 2.2 of the textbook. Round your final answer to the nearest $10 per kilowatt-hour.

E9P13

A vacuum cleaner draws power at 1200 Watt. If you clean your once a week, 20 minutes for each session. How much does that cost you in 1 year? Assume that the electricity costs is 5 dollar per unit.

A 100-W driveway light bulb is on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, what is the annual cost to operate the bulb?

You and your roommates are studying hard for your physics exam. You study late into the night and then fall into your bed for some sleep. You all wake early before the exam and scramble groggily around making breakfast. You can’t agree on what to have, so one of you cooks waffles on a 990-watt waffle iron while another toasts bread in a 900-watt toaster. You want to make coffee with a 650-watt coffeemaker, and you plug it into the same power strip into which the waffle iron and toaster are plugged. Will the 20-A circuit breaker remain operational?

Question #18. Calculate the cost of operating this light bulb in 10 seconds. Given 4pesos/kWhr. I (A) P=50W V (V) 200

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.)  __________¢

1. The Atmos clock(the so-called perpetual motion clock) gets its name from the fact that it runs off pressure vacations in the atmosphere, which drive a belows containing a mixture of gas and liquid ethyl chloride. Because the power to drive these clocks is so limited, they must be very efficient. In fact, a single 60.0 W lightbulb could power 240 million Atmos clocks simultaneously. Find the amount of energy, in joules, required to run an Atmos clock for one day. Explain and draws.