001 If the emf of a battery is 21 V and a current of 44 A is measured when the battery is shorted, what is the internal resistance of the battery? Answer in units of N. 002 A battery with a 14.6 V emf has a terminal voltage of 10.5 V when it delivers a current of 9.9 A to the starter of a car. What is the internal resistance of the bat- tery?
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- Multiple-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 VE9P10Figure 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.
- 22. An 8 ohm resistor and a 6 ohm resistor are connected in series with a battery. The potential difference across the 6 ohm resistor is measured as 12 V. What is the potential difference across the battery?A. 28 V B. 24 VC. 26 V D. 22 V 23. What is power dissipated in the resistor of 6 ohm in question 22?A. 20 W B. 24 WC. 22 W D. 32 Wa) From the graph, determine the emf (ϵϵ) of the battery. b) From the graph, determine the internal resistance (r) of the battery.60 Ω 4. A circuit is shown with the currents below. a) Find the current through the 60 Q resistor. Find the charge on the 2.0 µF capacitor. 10 Ω. 6.58A b) + 100 V 40 N 0.6SA 2.0 µF=
- The 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?In Europe the standard voltage in homes is 220 V instead of the 120 V used in the United States. Therefore a "100 W" European bulb would be intended for use with a 220 V potential difference. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Increasing the resistance. ▼ If you bring a "100 W" European bulb home to the United States, what should be its U.S. power rating? Express your answer to three significant figures and include the appropriate units. P = Submit Part B Value I = Request Answer Units How much current will the 100 W European bulb draw in normal use in the United States? Express your answer to three significant figures and include the appropriate units. Value Units ? wwwww ?