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Home Q & A Board Science-Related Homework Help Physics
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toni toni
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12 years ago
How do I find how much energy is stored in a capacitor given the current waveform graph?  Say the current is 6A for 0 < t < 1 micro-second and 0A for t > 1 micro-second.  How do I calculate the energy energy in the capacitor as a function of t?  Thanks.
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#1
12 years ago
Assuming all the current is going into the capacitor and increasing it's charge, then just calculate the charge.

6 amps is 6 C/s, so for a time total of 1 µs, you will have 6 µC of charge transferred.

With the charge and the value of the cap in farads, you can get the voltage, using Q = CV or V = Q/C

then use E = ½CV² = ½QV to get the Energy in the cap in Joules

.
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