How Do You Convert Charge to Energy in Capacitors?

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To convert charge in Coulombs to energy in Joules, the specific process must be defined, as the conversion depends on context. In experiments involving capacitors, the energy stored can be calculated using the formula E = 0.5 * C * V^2, where E is energy, C is capacitance, and V is voltage. For a 100 microfarad capacitor, knowing the voltage allows for energy calculation. The discussion emphasizes the importance of understanding the discharge process and the relationship between charge, capacitance, and voltage. Accurate measurements are crucial for determining whether the energy is sufficient for ignition.
Marte82
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Hi!

Can anybody tell me if there is a way to convert charge (in Coloumb) into energy (Joule). I know It's not just a quick and easy formula, but I would be most glad if anybody is able to help me..

:shy:
 
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Marte82 said:
Hi!

Can anybody tell me if there is a way to convert charge (in Coloumb) into energy (Joule). I know It's not just a quick and easy formula, but I would be most glad if anybody is able to help me..

:shy:

This conversion isn't possible without knowing that PROCESS this is relevant to. For example, one can do such a conversion for the amount of charge emitted per second from a photocathode that is detected by an anode via the measured photocurrent.

But without more description from you, this is impossible to do.

Zz.
 
ZapperZ said:
This conversion isn't possible without knowing that PROCESS this is relevant to. For example, one can do such a conversion for the amount of charge emitted per second from a photocathode that is detected by an anode via the measured photocurrent.

But without more description from you, this is impossible to do.

Zz.

I'm doing an experiment with static electricity; measuring the discharge (in nC) from a charged material by an electrode conected to a capacitor and a oscilloscope. And I want to know how big the energy is(so I can know weather the spark has enough energy to be an ignition source). Unfortunately I don't know the time for the discharge or the charging of the capacitor...
 
If you know the capacitance, there is an equation relating the energy stored (in Joules) to the capacitance and the voltage. Do you know this equation?
 
berkeman said:
If you know the capacitance, there is an equation relating the energy stored (in Joules) to the capacitance and the voltage. Do you know this equation?

The capasitor is 100 microFarat. What equation?
 
Marte82 said:
The capasitor is 100 microFarat. What equation?

This page discusses capacitors in general, and will help you figure out the equation for the stored energy:

http://en.wikipedia.org/wiki/Capacitor
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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