A flashlight has 4 – AA batteries. The combination has a capacity of 200 watt-sec. How long in mins will it take to discharge if the flashlight consumes 10 mA at 6 V?
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A flashlight has 4 – AA batteries. The combination has a capacity of 200 watt-sec. How long in
mins will it take to discharge if the flashlight consumes 10 mA at 6 V?
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- A walkman has 4 –AA batteries. The combination has a capacity of 200 watt-sec. How long will it take to discharge if walkman consumes 10mA at 6V?A battery may be rated in ampere – hours (Ah) lead-acid battery is rated at 160 Ah(a) What is the maximum current it can supply for 80 h?(b) How many days will it last if is discharged at 340mA?A 6-V car battery provides a current of 4 A to a load for 8 min. By how much is the chemical energy of the battery decreased during this time?
- An automobile dashboard ammeter shows 10.8 A of current flowing when the headlights are lit. If the current is drawn from the 12-V storage battery, what is the resistance of the headlights?For how many hours will a battery with an 32Ah rating theoretically provide a current of 1.28 A? (Answer in engineering notation)A light bulb is rated at 30 W when operated at 120 V. How much charge enters (and leaves) the light bulb in 4.1 min?
- A hot wire supplies 100 kJ in 10 minutes. What is the potential difference (in V) across the wire, when the current is 2 A ?A constant current of 2 A is required to charge a car battery for 3 hours. The terminal voltage is 12 V. i. How much charge is transported to the battery as the result of charging? ii. How much energy is expanded in Kilo Joule? iii. If the cost of electricity is 15 cents/kWh, how much is the charging cost?Energizer battery is capable of delivering 85mA for about 12h. How much charge can it release at that rate? If its terminals voltage is 1.2V, how much energy can the battery deliver?
- determine the power dissipated when a curren of 10 mA flows through an appliance having a resistance of 8 K ohmiosA 12 Volt lead-acid car battery, engineered for "up to 500 or more charge/discharge cycles," has a rating of 225 Ampere-hours. A one Ampere-hour battery can provide one Amp of current for one hour. It sells for $180. a) If initially fully charged, what is the total electrical energy that the battery can deliver before it needs to be recharged? b) The battery has a mass of 23.1 kg. What total mass of such batteries would be required to deliver the same effective mechanical energy as 16 gallons of gasoline? Assume that the efficiency of an electrically powered car is 2.5 times that of a gasoline-powered car for the conversion to mechanical energy, and that energy content of 1 gallon of gas =1.32×108 Joules. You're going to get a big number - this is why electric cars didn't become widespread until after the development of lithium ion batteries, which can achieve much higher energy densities.A refrigerator requires 220 V ac to operate properly and during this time, it draws a current of 2.5 A. What be the value of the resistance of the refrigerator ? How much energy (in kWh) it will consume if it operates for 5 h?