*46. Multiple-Concept Example 9 reviews the concepts that are im- portant to this problem. A light bulb is wired in series with a 144- resis- tor, and they are connected across a 120.0-V source. The power delivered to the light bulb is 23.4 W. What is the resistance of the light bulb? Note that there are two possible answers.
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- Three identical 100.0-W, 120-V lightbulbs are connected across a 120-V power source as shown in in the figure below. Assume that the resistance of each bulb is constant (even though in reality the resistance increases markedly with current). 120 V R₁ R₂ (a) Find the total power supplied by the power source. W = (b) Find the potential difference across each lightbulb. AV₁ AV₂ = AV₂ = Need Help? Read It R₂ V Master ItMultiple-Concept Example 9 reviews the concepts that are important to this problem. A light bulb is wired in series with a 117-0 resistor, and they are connected across a 120.0-V source. The power delivered to the light bulb is 21.3 W. What is the resistance of the light bulb? There are two possible answers. Give the larger of the two. Light bulb R2 P VFigure P18.19 shows a circuit diagram. (R1 = 1550 , R2 = 430 , ΔV = 20.5 V) (a) Determine the current. (b) Determine the potential of wire A relative to ground. (c) Determine the voltage drop across the 1550 resistor.
- 120V series-wired ornamental lightbulbs, Figure 1. Suppose you have a string of 48bulbs, each one with a resistance of 8.00Ω. Assume the resistance of a bulb with itsfilament broken drops to zero. Suppose that a bulb becomes dangerously warm, sothat it could set something on fire, if it receives a power of 1.75 W. How many bulbscan fail before the string of lights becomes dangerous?Ash is working in the lab, and comes across a box of unlabeled resistors (thanks to his messy coworker who never puts them back properly). He remembers that he can find out the resistance using an ammeter to measure current, and a battery with a known voltage. Ash picks a resistor of unknown resistance (in §), connects it to some wires, and then plugs in a battery with a voltage of 12.1 V. This creates a circuit. Using the ammeter, he finds that the current in the circuit is 5.2 A. In ohms, what is the resistance of the unknown resistor? Answer: Ω.You have a battery with a voltage of Vtotal = 25 V and two resistors, both with a resistance of R, = R, %3D 40 0. a. How can you connect the resistors to the battery (in series or parallel) in order to achieve the largest power dissipation? How much power is dissipated in this case?
- 6. Consider the combination of resistors shown in Figure P18.6. (a) Find the equivalent resistance between point a and b. (b) If a voltage of 35.0 V is applied between points a and b, find the current in each resistor. 1 12.0 N 4.00 N a 5.00 N 6.00 N 8.00 N Figure P18.6A 9.0 V battery is connected to three resistors as shown in the figure below with R₁ = 502, R₂ 100 , and R3 = 75 Q = a. Draw the equivalent simplified circuit diagram. b. Determine the current drawn from the battery. C. With the value of current from the battery, find the voltage across and current through each resistor. Enter the values in a table 9.0 V 50 Ω 100 (2 www ww 75 02Your car battery is dead, and your friends are helping you start your car with cheap jumper cables. One cable carries current from their car to your car, and a second cable returns that current to their car. As you try to start your car, a current of 80.0 A flows through the cables to your car and back, and a voltage drop of 6.00 V appears across each cable. If you replace the cheap cables with cables having half their electric resistance, what voltage drop will appear across each new cable if the current doesn't change? AV= i
- 4. A 12.0 V battery is connected to the resistor combination shown below. (a) How much current leaves the battery due to the resistors? (b) What is the current through each resistor? a 12 Q2 W R₁ R3 R₁ 692 w 692 692 www R₂ R₁ www 6Ω bThe tungsten filament of a light bulb uses 60 W when connected to a 120 V power line. When the bulb is cold, its resistance is 24 Ω. a. What is the resistance of the bulb when it is hot? b. What current flows through the bulb when it is cold? c. What current flows through the bulb when it is hot?help with this question.