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Physics 112 HW14 Due Wednesday, 15 October 2014 /6 P04. A light bulb (resistance > 0) is connected to an ideal voltage source (negligible internal resistance). The light bulb, of course, goes on. a) As the bulb heats up, its resistance increases. Does this make the bulb brighter, dimmer, or just as bright as when it first went on? Why? b) Add another bulb in series with the first bulb. Will the bulbs be brighter, dimmer, or just as bright as the first bulb alone? Why? c) Remove the 2nd bulb in series, and instead connect it in parallel with the first bulb. Will the bulbs be brighter, dimmer, or just as bright as the first bulb alone? Why? VIR01. The circuit at left consists of two 4.00 V batteries (the grey shaded areas) broken up into ideal EMF sources with internal c 9.00 Ω b 0.50 Ω resistances, along with two resistors. d a) What is the voltage difference 6.00 Ω between points a and d? 0.50 Ω a 8.00 Ω b) What is the terminal voltage across the 4 V battery? (What is the voltage 8.00 V one would measure across it when it is put in this circuit, or the voltage between points b and c?) c) A battery with EMF 10.30 V and internal resistance 0.50 Ω is inserted at point d in such a way that its negative terminal (the box) is connected to the negative terminal of the 8.0V battery. What is the terminal voltage across the 4 V battery now? ER01. Each resistor in the circuit at left has 10Ω. a) Calculate the equivalent resistance a between points a and b. A 100V battery is now connected across points a and b. b) How much current comes out of the battery? c) What is the voltage across and current through the bottom-most resistor? ER02. If an ohmmeter is connected between points a and b in each of the circuits below, what will it read? a) a 100Ω b b) 7Ω a 10Ω 50Ω 60Ω 75Ω 40Ω 25Ω 30Ω 20Ω 50Ω (over) 45Ω b b 2.00 Ω K01. In the circuit at right, find the current through and the voltage across each resistor. Also calculate the voltage difference between points a and b. 10.00 V 1.00 Ω 3.00 Ω a 5.00 V b 4.00 Ω 10.00 Ω K03. (Wolfson, Ch. 25 Problem 53) In the figure at right, find the current through R and give its direction. 270Ω 820Ω R 6V 4.5V 1.5 V 150Ω (over)