A 1.2-V mercury cell with a capacity of 2.0 A*h is used to power a cardiac...
A 1.2-V mercury cell with a capacity of 2.0 A*h is used to power a cardiac pacemaker. If the power required is 0.2 mW (1 mW = 1 milliwatt = 0.001 W), how long will the cell last in hours? (hint: first calculate the average current)
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A 1.2-V mercury cell with a capacity of 2.0 A*h is used to power
a cardiac...
A 1.35-V mercury cell with a capacity of 1.5 A h is used to power a...
A 1.35-V mercury cell with a capacity of 1.5 A h is used to power a cardiac pacemaker. (a) If the power required is 0.1 mW (1 mW = 1 milliwatt = 0.001 W), what is the average current? (b) How long will the cell last?
1. A battery with a capacity of 2500 mAh (milliamp-hours) is used to power a device...
1. A battery with a capacity of 2500 mAh (milliamp-hours) is used to power a device that constantly draws 400 mA of current. Assuming that the battery is ideal, how long will the battery last? The same battery as above is now used to power a clock that only draws current when the second hand "ticks". The current draw during this movement is 2mA. A clock ticks every second but note that the second hand doesn't take a second to...
Table 1 Cell Type Lithium-iodine Zinc-mercury Operating Cell Potential for Commercial Batteries, E (V) +2.80 +1.35...
Table 1 Cell Type Lithium-iodine Zinc-mercury Operating Cell Potential for Commercial Batteries, E (V) +2.80 +1.35 Table 2 Standard Reduction Potential, E" (V) Half-Reaction Zn(OH).1? +2e → Zn +40H Zn(OH), +2e → Zn +20H HgO + H2O +2e - Hg + 2OH 0, + 2 H2O + 4e 40H - 1.20 |--1.25 +0.10 +0.40 Pacemakers are electronic devices that help regulate the heart rate. Currently, lithium-iodine cells are commonly used to power pacemakers and have replaced zinc-mercury cells. Table 1...
A smoke detector operates on a 9 V battery having charge capacity of 4500 mA h....
A smoke detector operates on a 9 V battery having charge capacity of 4500 mA h. (a) If the battery needs to be changed approximately every 2 years, how much power does the smoke detector consume on average? (b) Assuming that the battery can be recharged through a charger providing 0.5 A current, how long would it take to fully charge the battery?
The capacity of a storage battery, such as those used in automobile electrical systems, is rated...
The capacity of a storage battery, such as those used in automobile electrical systems, is rated in ampere-hours (A⋅h). A 50 A⋅h battery can supply a current of 50 A for 1.0 h, or 25 A for 2.0 h, and so on. 1) What total energy can be supplied by a 12 V , 50 A⋅h battery if its internal resistance is negligible? Express your answer using two significant figures. 2) What volume (in liters) of gasoline has a total...
engineering (power)
A 300 km long 500 kV overhead transmission line connects a power plant to a grid substation. Per unit length parameters of the line are as follows: X=j0.32 Ω km-1; y=j5.2 x 10-6 S km-1 peak and off- peak power and respective voltages at line ends are as given bellow P, MW V1, kV V2, kV Peak 1575 510510Off-peak 945 510510 a) For both peak and off-peak times i. Determine current and reactive power at the receiving end of the line ii. Calculate voltage, current...
(a) The developer has proposed to build a teaching room with the dimension of 9.5m(L) x 6m(W) x 3.5m(H) with maximum capacity of 100 people. The teaching room will be used for speech. Determine t...
(a) The developer has proposed to build a teaching room with the dimension of 9.5m(L) x 6m(W) x 3.5m(H) with maximum capacity of 100 people. The teaching room will be used for speech. Determine the amount of absorption required for the optimum reverberation time at unit of m2). (Assuming that the optimum volume per person for teaching room is 2.5m desk, each chair and each person carries the absorption coefficient of 0.8 m2, 0.7 m* and 500Hz (in the 2...
. A typical commercial wind turbine costs approximately $2 million per MW of installed power and...
. A typical commercial wind turbine costs approximately $2 million per MW of installed power and requires 5.76 TJ per million dollars of energy to manufacture the wind turbine. (a) Calculate the amount of energy that is consumed (i.e. energy invested) in the manufacture ofa 1.5 MW wind turbine, assuming that turbine manufacture requires 5.76 TJ per million dollars spent. (TJ Tera-joules 1012 joules) (b) If the wind turbine has blades that are 40 meters (radius) long and the average...
1. If the cell voltage is 0.473 V what is the pH of the cathode compartment...
1. If the cell voltage is 0.473 V what is the pH of the cathode compartment for the following cell where E° (Zn2+Zn) = -0.7618 V? Zn(s)[Zn2+(aq, 1.00 M)|| H*(aq, ? M)|H2(g. 1 atm)Pt(s) Dobe r to bola piwostinavia 2. Gold can be plated out of a solution containing Au according to the half-reaction Au (aq) + 3 e- - Au(s) v o n 18 How long will it take to plate out 10.0 g Au(s) (Mau = 197.0 g/mol)...
K L M N O P B6 : x V for А в F G H...
K L M N O P B6 : x V for А в F G H I J 1 Part 1 2 Pottery Inc., is divided into 2 operating divisions: Pottery and Retail. The company allocates Power and General Factory department costs to each operating division. 3 Power costs are allocated on the basis of the number of machine hours and general factory costs on the basis of square footage. 4 Allocation for the coming year are based on the...
1. A battery with a capacity of 2500 mAh (milliamp-hours) is used to power a device that constantly draws 400 mA of current. Assuming that the battery is ideal, how long will the battery last? The same battery as above is now used to power a clock that only draws current when the second hand "ticks". The current draw during this movement is 2mA. A clock ticks every second but note that the second hand doesn't take a second to...
Table 1 Cell Type Lithium-iodine Zinc-mercury Operating Cell Potential for Commercial Batteries, E (V) +2.80 +1.35 Table 2 Standard Reduction Potential, E" (V) Half-Reaction Zn(OH).1? +2e → Zn +40H Zn(OH), +2e → Zn +20H HgO + H2O +2e - Hg + 2OH 0, + 2 H2O + 4e 40H - 1.20 |--1.25 +0.10 +0.40 Pacemakers are electronic devices that help regulate the heart rate. Currently, lithium-iodine cells are commonly used to power pacemakers and have replaced zinc-mercury cells. Table 1...
(a) The developer has proposed to build a teaching room with the dimension of 9.5m(L) x 6m(W) x 3.5m(H) with maximum capacity of 100 people. The teaching room will be used for speech. Determine the amount of absorption required for the optimum reverberation time at unit of m2). (Assuming that the optimum volume per person for teaching room is 2.5m desk, each chair and each person carries the absorption coefficient of 0.8 m2, 0.7 m* and 500Hz (in the 2...
. A typical commercial wind turbine costs approximately $2 million per MW of installed power and requires 5.76 TJ per million dollars of energy to manufacture the wind turbine. (a) Calculate the amount of energy that is consumed (i.e. energy invested) in the manufacture ofa 1.5 MW wind turbine, assuming that turbine manufacture requires 5.76 TJ per million dollars spent. (TJ Tera-joules 1012 joules) (b) If the wind turbine has blades that are 40 meters (radius) long and the average...
1. If the cell voltage is 0.473 V what is the pH of the cathode compartment for the following cell where E° (Zn2+Zn) = -0.7618 V? Zn(s)[Zn2+(aq, 1.00 M)|| H*(aq, ? M)|H2(g. 1 atm)Pt(s) Dobe r to bola piwostinavia 2. Gold can be plated out of a solution containing Au according to the half-reaction Au (aq) + 3 e- - Au(s) v o n 18 How long will it take to plate out 10.0 g Au(s) (Mau = 197.0 g/mol)...
K L M N O P B6 : x V for А в F G H I J 1 Part 1 2 Pottery Inc., is divided into 2 operating divisions: Pottery and Retail. The company allocates Power and General Factory department costs to each operating division. 3 Power costs are allocated on the basis of the number of machine hours and general factory costs on the basis of square footage. 4 Allocation for the coming year are based on the...
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