The pedestrian crossing of Washington Road and Ivy Lane (near the Physics building a) needs a back-up battery in event of power failure. In order for the three lights to be bright enough to be seen in daylight, each of the three R1 the 3 lights are connected in parallel (see the drawing), and the open circuit voltage of the battery (that is, the voltage when there is no current) is Vo = 110 volts. What is the maximum internal battery resistance R; allowable given that each lamp must dissipate 220 watts? 50 N lights must dissipate P = 220 watts. Suppose

The pedestrian crossing of Washington Road and Ivy Lane (near the Physics building a) needs a back-up battery in event of power failure. In order for the three lights to be bright enough to be seen in daylight, each of the three R1 the 3 lights are connected in parallel (see the drawing), and the open circuit voltage of the battery (that is, the voltage when there is no current) is Vo = 110 volts. What is the maximum internal battery resistance R; allowable given that each lamp must dissipate 220 watts? 50 N lights must dissipate P = 220 watts. Suppose

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 62P: A man foolishly tries to fish a burning piece of bread from a toaster with a metal butter knife and...

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A man foolishly tries to fish a burning piece of bread from a toaster with a metal butter knife and comes into contact with 120-V ac. He does not even feel it since, luckily, he is wearing rubber-soled shoes. What is the minimum resistance of the path tire current follows through the person?
An electric eel generates electric currents through its highly specialized Hunters organ, in which thousands of disk-shaped cells called electrocytes are lined up in series, very much in the same way batteries are lined up inside a flashlight. When activated, each electrocyte can maintain a potential difference of about 150 mV at a current of 1.0 A for about 2.0 ms. Suppose a grown electric eel has 4.0 103 electrocytes and can deliver up to 3.00 102 shocks in rapid series over about 1.0 s. (a) What maximum electrical power can an electric eel generate? (b) Approximately how much energy does it release in one shock? (c) How high would a mass of 1.0 kg have to be lifted so that its gravitational potential energy equals the energy released in 3.00 102 such shocks?
The values of the components in a simple series RC circuit containing a switch (Fig. P21.53) are C = 1.00 F, R = 2.00 106 , and = 10.0 V. At the instant 10.0 s after the switch is closed, calculate (a) the charge on the capacitor, (b) the current in the resistor, (c) the rate at which energy is being stored in the capacitor, and (d) the rate at which energy is being delivered by the battery.
When the switch is open in Figure 18.8, power Po is delivered to the resistor R1. When the switch is closed, which of the following is true about the power Pc delivered to R1? (Neglect the internal resistance of the battery.) (a) Pc Po (b) Pc = Po (c) Pc Po Figure 18.8 (Quick Quizzes 18.5 and 18.6)
(a) What is the unknown emfx in a potentiometer that balances when Rxis 10.0 O, and balances when Rsis 15.0for a standard 3.000-V emf? (b) The same emfx is placed in the same potentiometer, which now balances when Rsis 15.0for a standard emf of 3.100 V. At what resistance Rxwill the potentiometer balance?
Consider the following figure. (Assume R1 = 5.40 Ω, R2 = 5.50 Ω, and = 16.0 V.) An open circuit begins at point a with a wire extending horizontally leftwards until it reaches a 4.00 V battery with the positive terminal on the left. After the battery, the wire splits into two branches. One branch continues left to a resistor R1, turns downwards and continues to a battery with emf ℰ with the positive terminal on top, and then turns rightwards. The other branch goes downwards and contains a resistor R2. The two branches recombine and the wire extends rightwards until it reaches a 10.0 Ω resistor before ending at point b. (a) Calculate the magnitude of the potential difference between points a and b in the figure above. V(b) Identify which point is at the higher potential. point apoint b they are at equal potentials
A potentiometer consisting of a wire of length = 10 cm has a source of emf, ɛ = 15V connected across it. When a standard cell with emf V = 6V, in series with a voltmeter, is connected at one end of the wire and at a distance L along the wire the voltmeter circuit is in balance and the voltmeter reads zero. What is the value of the balance length L? Select one: a. 2.0 cm b. 4.0 cm c. 1.5 cm d. 6.0 cm
You connect a battery, resistor, and capacitor as in (Figure 1), where R = 14.0 Ω and C = 3.00 ×10^-6 F. The switch S is closed at t = 0. When the current in the circuit has magnitude 3.00 A, the charge on the capacitor is 40.0 × 10^−6 C. At what time t after the switch is closed is the charge on the capacitor equal to 40.0 x 10^-6 C? When the current has magnitude 3.00 A, at what rate is energy being stored in the capacitor?
Consider the circuit shown in the drawing. The circuit contains a battery, several wires, two identical light bulbs, and two switches, which are initially open, so no current passes through the circuit elements. Which of the following statements is false? Assume for this question that the resistances of the two light bulbs are identical and don't change.
To get the maximum current, the connection should be in parallel. If you create a parallel connection with 30V DC source and three resistors with R1 = 50Ω, R2 = 75Ω, and R3 = 100Ω, how do you calculate for the total current (IT) and the current flowing in each resistor (I1, I2, I3), and the total voltage (VT) and the voltage across each resistor (V1, V2, V3)? How do you also determine the power dissipated by each resistor (P1, P2, P3) and by the whole circuit (PT)??
Jio Almonte is the executive assistant in the Torralba-Santos group of companies. Because of his background in computer engineering, he has been the "go-to" guy for repairing desktop computers in the company. One day, while he was troubleshooting a co-worker's 12-volt power supply, he was electrocuted. Seeing that he forgot to wear his gloves, and he was deliberately pulled to fix it while he was washing his coffee mug, the others worried that he might not survive and immediately dialed 911. Knowing that standard power supplies run on 300 W of power, and the Philippines uses 230 V as residential voltage stated in the Philippine Electrical Code, compute for the current flowing in the power supply.
A charged capacitor of C=45.0 μF is connected to a resistor of R=2.8 MΩ as shown in the figure. The switch S is closed at time t=0. Find the time (in seconds) it takes the current to fall to 0.25 of its initial value.