100 MW of power from a power station is transmitted to a distant substation through a cable of resistance 10 2 at (a) 20,000 V and (b) 200 V. Find the power loss in the cable in each case.
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- (a) What energy is dissipated by a lightning bolt having a 21,800 A current, a voltage of 110 MV, and a time duration of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water with a specific heat of 4184 J/(kg · °C) and a latent heat of vaporization of 2256 x 103 J/kg? kgA coffee maker is rated at 1.20 kW, a toaster at 1.10 kW, and a waffle maker at 1.40 kW. The three appliances are connected in parallel to a common 120 V household circuit. (d) What total current is delivered to the appliances when all are operating simultaneously?A person notices a mild shock if the current along a path through the thumb and index finger exceeds 80x10^-6 A. Compare the maximum possible voltage without shock across the thumb and index finger with a dry skin resistance of 4.0x10^5 Ohms and a wet skin resistance of 2000 Ohms. (Type your answer in essay type, showing the rationalization)?
- An electric washing machine draws 2.1 A when connected to a 121 V power line. In Arkansas, the average price of electricity is $0.090 per kilowatt-hour. To the nearest cent, how much does it cost to use the washing machine to wash one load of colors and one load of whites if the washing machine runs for 35 min each time it is used? Remember, round to two decimal places, the nearest cent.All household circuits are wired in parallel. A 1140-W toaster, a 300-W blender, and a 50-W lamp are plugged into the same outlet. (The three devices are in parallel when plugged into the same outlet.) Assume that this is the standard household 120-V circuit with a 15-A fuse. (a) What current is drawn by each device? Itoaster = A Iblender = A Ilamp A (b) To see if this combination will blow the 15-A fuse, find the total current used when all three appliances are on. Itotal =A 240V household appliance has an electrical resistance of 187 Ohms. How much energy will it use in 52.8 seconds. Express your answer in kilojoules to at least 3 significant figures.