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Unformatted text preview: Problems from book 1. A 1.5 V battery stores 5.4 kJ of energy. How long can it light a flashlight bulb that draws 0.60 A? 2. A 6.0 V battery has an internal resistance of 2.1 Ω . If the battery is short-circuited, what is the rate of energy dissipation in its internal resistance? 3. If you accidentally leave your car headlights (current drain 9 A) on for two and a half hours, how much of the 12 V battery's chemical energy is used up? 4. A 44 k Ω resistor and a 35 k Ω resistor are in parallel, and the pair is in series with a 16 k Ω resistor. What is the resistance of the combination? 5. (a) Find the current supplied by the battery in the figure ( R 1 = 380 Ω and R 2 = 100 Ω ) (b) Find the voltage across the 180 Ω resistor. 6. A 2.0 μF capacitor is charged to 10 V. It is then connected across a 600 k Ω resistor. (a) How long does it take for the capacitor voltage to reach 5 V? (b) How long does it take for the energy stored in the capacitor to decrease to half its initial value? 7. A capacitor is charged until it holds 7.0 J of energy. It is then connected across a 10 k Ω resistor. In 8.1 ms, the resistor dissipates 2.0 J. What is the capacitance? resistor dissipates 2....
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