Questions and Answers of Fundamentals Electric Circuits

Calculate Voand Ioin the circuit ofFig. 2.99. 30 Ω 70 Ω 200 V 20 Ω 5Ω
Find i and Voin the circuit ofFig. 2.100. 80 2 24 Q ww 25 2 30 Ω : 20 Ω 20 V V. 20 2 60 Ω
Evaluate Reqlooking into each set of terminals for each of the circuits shown inFig. 2.103.a.b. 62 ww- 3 k2 2 k2 6 k2 ww 6 k2
For the ladder network inFig. 2.104, find I and Req. 82 62 15 V Rea
For the circuits inFig. 2.108, obtain the equivalent resistance at terminals a-b. 20 2 www 30 2 30 2 be
Find I in the circuit ofFig. 2.110. 20 2 24 2 10 2 140 V 36 2 ww- 362 14 2 362
Design a problem to help other students better understand wye-delta transformations usingFig. 2.114.What value of R in the circuit of Fig. 2.114 would cause the current source to deliver 800 mW
For the circuit shown inFig. 2.116, find the equivalent resistance. All resistors are 3Î©. ww R. 'eq
Consider the circuit inFig. 2.118. Find the equivalent resistance at terminals: (a) a-b, (b) c-d. 450 2 10 2 300 2 300 2 450 2 60 2
Calculate Ioin the circuit ofFig. 2.119. 700 2 400 2 200 2 100 V 1.7 k2 800 2 400 2 +1)
The 150 W light bulb inFig. 2.122 is rated at 110 volts. Calculate the value of Vs to make the light bulb operate at its rated conditions. 150 Watt 100 2 +. ww- 50 2
An enterprising young man travels to Europe carrying three light bulbs he had purchased in North America. The light bulbs he has are a 100-W light bulb, a 60-W light bulb, and a 40-W light bulb. Each
If the three bulbs of Prob. 2.59 are connected in parallel to the 120-V source, calculate the current through each bulb.Prob 2.59An enterprising young man travels to Europe carrying three light bulbs
As a design engineer, you are asked to design a lighting system consisting of a 70-W power supply and two light bulbs as shown in Fig. 2.124. You must select the two bulbs from the following three
A three-wire system supplies two loads A and B as shown inFig. 2.125. Load A consists of a motor drawing a current of 8 A, while load B is a PC drawing 2 A. Assuming 10 h/day of use for 365 days and
The potentiometer (adjustable resistor) RxinFig. 2.126 is to be designed to adjust current ix from 10 mA to 1 A. Calculate the values of R and Rxto achieve this. Rx 110 V
Design a circuit that uses a d’Arsonval meter (with an internal resistance of 2 kΩ that requires a current of 5 mA to cause the meter to deflect full scale) to build a voltmeter to read values of
An ammeter model consists of an ideal ammeter in series with a 20-Î© resistor. It is connected with a current source and an unknown resistor Rxas shown inFig. 2.133. The ammeter reading is
The charge entering the positive terminal of an element isq = 5 sin 4 π t mCwhile the voltage across the element (plus to minus) isv = 3 cos 4 π t V(a) Find the power delivered to the element at t
How much charge is represented by these number of electrons?(a) 6.482 × 1017(b) 1.24 × 1018(c) 2.46 × 1019(d) 1.628 × 1020
Determine the current flowing through an element if the charge flow is given by(a) q(t) = (3) mC(b) q(t) = (4t2 + 20t − 4) C(c) q(t) = (15e−3t − 2e−18t) nC(d) q(t) = 5t2(3t3 + 4) pC(e) q(t) =
A total charge of 300 C flows past a given cross section of a conductor in 30 seconds. What is the value of the current?
Determine the total charge transferred over the time interval of 0 ≤ t ≤ 10 s when i( t) = 1/2 t A.
The current flowing past a point in a device is shown inFig. 1.25. Calculate the total charge through the point. i (mA) 10 2 t (ms)
A lightning bolt with 10 kA strikes an object for 15 μs. How much charge is deposited on the object?
A rechargeable flashlight battery is capable of delivering 90 mA for about 12 h. How much charge can it release at that rate? If its terminal voltage is 1.5 V, how much energy can the battery deliver?
The voltage v(t) across a device and the current i(t) through it arev(t) = 20 sin (4t) V and i(t) = 10(1 + e−2t) mACalculate:(a) The total charge in the device at t = 1 s, q(0) = 0.(b) The power
The current entering the positive terminal of a device is i(t) = 6e−2t mA and the voltage across the device is v(t) = 10di∕dtV.(a) Find the charge delivered to the device between t = 0 and t = 2
Figure 1.28 shows a circuit with four elements, p1= 60 W absorbed, p3= ˆ’145 W absorbed, and p4= 75 W absorbed. How many watts does element 2 absorb? 3 4 2.
Find I and the power absorbed by each element in the network ofFig. 1.30. 44 A 10 A ) 15 V 15 V +. (1+
A lightning bolt strikes an airplane with 40 kA for 1.7 ms. How many coulombs of charge are deposited on the plane?
A 1.8-kW electric heater takes 15 min to boil a quantity of water. If this is done once a day and power costs 10 cents/kWh, what is the cost of its operation for 30 days?
A utility company charges 8.2 cents/kWh. If a consumer operates a 60-W light bulb continuously for one day, how much is the consumer charged?
A 1.2-kW toaster takes roughly 4 minutes to heat four slices of bread. Find the cost of operating the toaster twice per day for 2 weeks (14 days). Assume energy costs 9 cents/kWh.
A cell phone battery is rated at 3.85 V and can store 10.78 watt-hours of energy.(a) How much average current can it deliver over a period of 3 hours if it is fully discharged at the end of that
Reliant Energy (the electric company in Houston, Texas) charges customers as follows:Monthly charge $6First 250 kWh @ $0.02/kWhAll additional kWh @ $0.07/kWhIf a customer uses 2,436 kWh in one month,
In a household, a business is run for an average of 6 h/day. The total power consumed by the computer and its printer is 230 W. In addition, a 75-W light runs during the same 6 h. If their utility
A lightning bolt carried a current of 2 kA and lasted for 3 ms. How many coulombs of charge were contained in the lightning bolt?
A telephone wire has a current of 20μA flowing through it. How long does it take for a charge of 15 C to pass through the wire?
The graph inFig. 1.33 represents the power drawn by an industrial plant between 8:00 and 8:30 a.m. Cal culate the total energy in MWh consumed by the plant. p (MW) 3 8.00 8.05 8.10 8.15 8.20
A battery can be rated in ampere-hours (Ah) or watt hours (Wh). The ampere hours can be obtained from the watt hours by dividing watt hours by a nominal voltage of 12 V. If an automobile battery is
A total of 2 MJ are delivered to an automobile battery (assume 12 V) giving it an additional charge. How much is that additional charge? Express your answer in ampere-hours.
How much energy does a 10-hp motor deliver in 30 minutes? Assume that 1 horsepower = 746 W.
A 600-W TV receiver is turned on for 4 h with nobody watching it. If electricity costs 10 cents/kWh, how much money is wasted?

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