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Introductory Physics Homework Help
Calculating Capacitance for Optimal Light-Bulb Performance
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[QUOTE="EzequielSeattle, post: 4979425, member: 526719"] [h2]Homework Statement [/h2] Imagine that you have a light-bulb that has a resistance of about 10 ohms and that can tolerate a maximum voltage of 3 volts. Imagine that you want to connect this to a charged capacitor large enough to keep the bulb glowing reasonably brightly for more than 10 seconds. Roughly what should the capacitor's capacitance be? [h2]Homework Equations[/h2] V[SUB]C[/SUB](t) = V[SUB]0[/SUB]e[SUP](-t/RC)[/SUP] [h2]The Attempt at a Solution[/h2] I feel as if I need another equation for this problem, because I don't have 4 variables to plug in! The starting potential of the capacitor should be 3 volts, right? So V[SUB]C[/SUB](t) = (3 volts)e[SUP](-10 seconds/(10 ohms)*C)[/SUP] So now I have unknowns of C and V[SUB]C[/SUB], and I need to solve for C. Clearly I'm missing something, but I'm not sure what... Can somebody point me in the approximately right direction? Thank you! [/QUOTE]
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Introductory Physics Homework Help
Calculating Capacitance for Optimal Light-Bulb Performance
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