Loose Leaf for Engineering Circuit Analysis Format: Loose-leaf
9th Edition
ISBN: 9781259989452
Author: Hayt
Publisher: Mcgraw Hill Publishers
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Chapter 2, Problem 67E
You have found a way to directly power your wall clock (consumes 0.5 mW of power) using a solar cell collecting ambient room light, rather than using an AA battery. The solar cell and battery each provide the required voltage of 1.5 V and the proper current for clock operation. Your solar cell has an efficiency of 15% and costs $6, and each AA battery has a capacity of 1200 mAh and costs $1. What is the payback time (point in time where the cost of solar cell would match the cost for supplying batteries) for using a solar cell instead of batteries?
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Chapter 2 Solutions
Loose Leaf for Engineering Circuit Analysis Format: Loose-leaf
Ch. 2.1 - A krypton fluoride laser emits light at a...Ch. 2.1 - A typical incandescent reading lamp runs at 60 W....Ch. 2.2 - In the wire of Fig. 2.7, electrons are moving left...Ch. 2.2 - For the element in Fig. 2.11, v1 = 17 V. Determine...Ch. 2.2 - Prob. 6PCh. 2.2 - Determine the power being generated by the circuit...Ch. 2.2 - Determine the power being delivered to the circuit...Ch. 2.2 - Your rechargeable smartphone battery has a voltage...Ch. 2.3 - Find the power absorbed by each element in the...Ch. 2.4 - Prob. 11P
Ch. 2.4 - Prob. 12PCh. 2.4 - The power absorbed by the resistor if i = 3 nA and...Ch. 2 - Convert the following to engineering notation: (a)...Ch. 2 - Convert the following to engineering notation:...Ch. 2 - Prob. 3ECh. 2 - Prob. 4ECh. 2 - Convert the following to SI units, taking care to...Ch. 2 - Prob. 6ECh. 2 - It takes you approximately 2 hours to finish your...Ch. 2 - A certain krypton fluoride laser generates 15 ns...Ch. 2 - Your recommended daily food intake is 2500 food...Ch. 2 - An electric vehicle is driven by a single motor...Ch. 2 - Under insolation conditions of 500 W/m2 (direct...Ch. 2 - A certain metal oxide nanowire piezoelectricity...Ch. 2 - Assuming a global population of 9 billion people,...Ch. 2 - The total charge flowing out of one end of a small...Ch. 2 - Prob. 15ECh. 2 - The total charge stored on a 1 cm diameter...Ch. 2 - A mysterious device found in a forgotten...Ch. 2 - A new type of device appears to accumulate charge...Ch. 2 - The current flowing through a tungsten-filament...Ch. 2 - The current waveform depicted in Fig. 2.28 is...Ch. 2 - The current waveform depicted in Fig. 2.29 is...Ch. 2 - A wind power system with increasing windspeed has...Ch. 2 - Two metallic terminals protrude from a device. The...Ch. 2 - The convention for voltmeters is to use a black...Ch. 2 - Determine the power absorbed by each of the...Ch. 2 - Determine the power absorbed by each of the...Ch. 2 - Determine the unknown current for the circuit in...Ch. 2 - A constant current of 1 ampere is measured flowing...Ch. 2 - Determine the power supplied by the leftmost...Ch. 2 - The currentvoltage characteristic of a silicon...Ch. 2 - A particular electric utility charges customers...Ch. 2 - The Tilting Windmill Electrical Cooperative LLC...Ch. 2 - A laptop computer consumes an average power of 20...Ch. 2 - You have just installed a rooftop solar...Ch. 2 - Prob. 35ECh. 2 - Some of the ideal sources in the circuit of Fig....Ch. 2 - Prob. 37ECh. 2 - Refer to the circuit represented in Fig. 2.35,...Ch. 2 - Prob. 39ECh. 2 - Prob. 40ECh. 2 - Prob. 41ECh. 2 - Determine the magnitude of the current flowing...Ch. 2 - Real resistors can only be manufactured to a...Ch. 2 - (a) Sketch the current-voltage relationship...Ch. 2 - Prob. 45ECh. 2 - Figure 2.38 depicts the currentvoltage...Ch. 2 - Examine the I-V characteristics in Fig. 2.38....Ch. 2 - Determine the conductance (in siemens) of the...Ch. 2 - Determine the magnitude of the current flowing...Ch. 2 - A 1% tolerance 1 k resistor may in reality have a...Ch. 2 - Utilize the fact that in the circuit of Fig. 2.39,...Ch. 2 - For the circuit in Fig. 2.39, suppose that the...Ch. 2 - For each of the circuits in Fig. 2.40, find the...Ch. 2 - Sketch the power absorbed by a 100 resistor as a...Ch. 2 - You built an android that has a subcircuit...Ch. 2 - Using the data in Table 2.4, calculate the...Ch. 2 - Prob. 58ECh. 2 - Prob. 59ECh. 2 - Prob. 60ECh. 2 - The resistance values in Table 2.4 are calibrated...Ch. 2 - Prob. 62ECh. 2 - Prob. 63ECh. 2 - The network shown in Fig. 2.42 can be used to...Ch. 2 - Prob. 65ECh. 2 - An LED operates at a current of 40 mA, with a...Ch. 2 - You have found a way to directly power your wall...
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