How long can a 12V car battery supply 250A to a starter motor if the battery has 4×10 J of chemical energy that can be converted to electric energy?
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How long can a 12V car battery supply 250A to a starter motor if the battery has
4×10 J of chemical energy that can be converted to electric energy?
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- Every day a certain household uses a 3,3 kW electric stove for 72 minutes, six 6 hours each and miscellaneous appliances amounting to 1,6 kW h. The 3 kW hot w ninutes during the day. If electricity costs 35 c a kWhA standard flashlight battery can deliver about 4.9 W.h of energy before it runs down. (a) If a battery costs 80 cents, what is the cost in dollars of operating a 100 W lamp for 8.8 h using batteries? (b) What is the cost in dollars if power is provided at the rate of 6.0 cents per kilowatt-hour? (a) Number (b) Number Mi i Units UnitsAt home I have a 350W motorized washing machine that I use to wash three times a week, 2 batches of clothes of 22 minutes each each time. Based on this problem, answer the following questions: a) How much energy in Joules do I "consume" in a year? (use 52 weeks for your calculation) b) based on the conditions of the previous question, what consumption would you have in kWh? c) How much do I pay, annually, in dollars, for the use of the washing machine, if the rate for energy from my electric company is 0.17443 / kWh?
- How long must a 100-W light bulb run in order to consume a million joules of electrical energy?In a certain city, electricity costs $0.12 per kW · h. What is the annual cost for electricity to power a lamppost for 7.50 h per day with a 100. W incandescent light bulb versus an energy efficient 25 W fluorescent bulb that produces the same amount of light? Assume 1 year = 365 days. 100. W bulb: $ lyear 25 W bulb: $ lyear A typical incandescent bulb costs $0.89 and lasts for about a year; a typical energy efficient fluorescent bulb costs about $3.49 and lasts for about 3 years. Is the additional cost of the fluorescent bulb justified?A standard flashlight battery can deliver about 2.3 W-h of energy before it runs down. (a) If a battery costs 80 cents, what is the cost in dollars of operating a 100 W lamp for 9.1 h using batteries? (b) What is the cost in dollars if power is provided at the rate of 6.0 cents per kilowatt-hour? (a) Number Units (b) Number Units
- If a battery contains 2500 milliAmp-hours (mAh) of charge, how much total energy can it deliver while operating an electrical device at 3.15 volts?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?You and your housemate have an argument over the cost of the electric bill. You want to turn off the outside porch light before going to bed each night. Your housemate wishes to keep the light on from 6:00 PM each evening to 6:00 AM the next morning and says that this will not add any significant amount to the electric bill. If the porch light bulb is a 65 W bulb, how much will your housemate's plan contribute to the electric bill each month? Take the number of days in a month as 30 and the average cost of electricity is 12.9¢/kW · h. $
- A standard flashlight battery can deliver about 2.0 Wh of energy before it runs down. (a) If a battery costs US$0.80, what is the cost of operating a 100 W lamp for 8.0 h using batteries? (b)What is the cost if energy is provided at the rate of US$0.06 per kilowatt-hour?A compact fluorescent lamp (CFL) uses less energy than its equivalent incandescent lamp. How much will a person save if s/he uses a 20 W CFL instead of a 100 W incandescent lamp for 6 hours in 30 days? Electricity is priced at P8.17/kWatt-HrPlease help: A car battery does 400 J of work on the charge passing through it as it starts an engine. (A) If the emf of the battery is 12V, how much charge passes through the battery during the start? Express answer using two significant figures. (B) if the emf is doubled to 24 V, does the amount of charge passing through the battery increase or decrease?