T3.8 A DMFC gives 0.8 Volts working in standard conditions. Which is the overall efficiency of the cell?
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Q: Problem 36: Suppose the cost of an incandescent bulb is 23 cents and that electricity costs 15…
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- A standard flashlight battery can deliver about 4.9 W.h of energy before it runs down. (a) If a battery costs 80 cents, what is the cost in dollars of operating a 100 W lamp for 8.8 h using batteries? (b) What is the cost in dollars if power is provided at the rate of 6.0 cents per kilowatt-hour? (a) Number (b) Number Mi i Units Units@The constant potential difference across a 2 ohm resistor is 20 volts. How many watts of power are dissipated by this resistor?
- H 3a 6v R tami V ܝܐ 412 www. 5a 8 www 12V FIND: V, I, & RIn the figure &₁ = 2.97 V, 82=0.938 V, R₁ = 4.44 Q, R₂ = 2.110, R3 = 3.71 Q, and both batteries are ideal. What is the rate at which energy is dissipated in (a) R₁, (b) R2, and (c) R3? What is the power of (d) battery 1 and (e) battery 2? www R₁ =48₁ www ww R R$ (a) Number (b) Number E₂1 (c) Number i (d) Number i (e) Number i Textbook and Media Units Units Units Units Units کے. Two 6.0 µF capacitors, two 2.2 k resistors, and a 12.5 V source are connected in series. Starting from the uncharged state, how long does it take for the current to drop from its initial value to 1.30 mA? . An RC circuit has R=6.7k and C= 2.0 µF. The capacitor is at a voltage Vo at t=0, when the switch is closed. How long does it take the capacitor to discharge to 1.0% of its initial voltage?
- Problem 6: Suppose the cost of an incandescent bulb is 23 cents and that electricity costs 12 cents/kWh. Compact fluorescent lightbulbs (CFL), while they are more expensive, use 1/10 of the power for the same amount of illumination. What would be the maximum cost (in dollars) of a CFL such that the total cost (investment plus operating) would be the same for both CFL and incandescent 60 W bulbs? Assume both lightbulbs run for 1000 h.In the figure, R, = 48 2, wiwwwn w 24a are R, Rz R3 R, = 72 o and R3 = 24 a are connected across points "a" and "b". A potential difference V = 432 volts is applied across the system . What is the power dissipation in resistor R,? (in watts) %3D %3D5. A resistor R₂=5.0 2 is mounted in parallel with a resistor R3 =7.0 2, and this combination is connected in series with a resistor R₁ 7.0 2 and a 24 Volts battery. What is the power dissipated in the R₂ resistor? Watts R₁ R₂ www- R3 vlt
- A certain capacitor, in series with a resistor, is being charged. At the end of 10 ms its charge is half the final value. The time constant for the process is about: 5.0 ms 6.9 ms 10 ms 14 ms 20 ms11. In Fig. 1, the resistances are R1 10.0 V and ɛ2 = 20.0 V, ɛ3 = by step solution) 20.0 2 and R2 = 30.0 2, and the ideal batteries have emfs 15.0 V. What is the voltage across R2? (Fig.1) (Show step %3D Ej = R R Fig.1 R2 R R 3. English (United States) K Accessibility: Unavailable 一你要搜索的内容A toaster oven is rated at 1900 WW for operation at 120 VV, 60 HzHz. Part A What is the resistance of the oven heater element? Express your answer with the appropriate units. Part B What is the peak current through it? Express your answer with the appropriate units. Part C What is the peak power dissipated by the oven? Express your answer with the appropriate units.