A battery is a chemical device for storing energy. A capacitor is also a device for storing energy.Discuss the possibility of replacing batteries with capacitors.Is it prctical? Why?
Tnx. I hope someone can help me.
2007-12-12 22:52:59 · 4 answers · asked by the Divine 2 in Science & Mathematics ➔ Physics
A perfect capacitor could conceivably replace a battery, but batteries can supply more current, and for longer periods of time.
Also there is no such thing as a perfect dielectric, therefore over time a capacitor would lose it's charge due to leakage.
A battery is a constant-current source, whereas a capacitor will discharge about 86% of it's stored charge in the first time-constant, then will discharge 86 percent of what's left in the second time constant, etc.
A chemical battery can recharge itself through chemical reaction, a capacitor cannot. A capacitor must be recharged from an external source.
Some devices (pagers, cell phones, Ipods, etc) use capacitors to retain the information stored in logic circuits when a battery is changed so no information is lost, but they do this for only a short period of time. Once the capacitor discharges below a certain level, the transistors of the logic circuits go into cutoff, the and the stored information is lost.
I hope this helps?
2007-12-12 23:06:23 · answer #1 · answered by Foxfire 4 · 0⤊ 0⤋
There's a lot more potential energy per unit volume in a chemical device than a capacitive one. It's all about packaging. You'd need a truckload of caps to store the energy contained in one car battery.
2007-12-13 01:44:28 · answer #2 · answered by the_meadowlander 4 · 0⤊ 0⤋
The above solutions are quite precise. as nicely, a capacitor could have a "noise clear out" functionality, it is to shrink the quantity of undesirable greater frequency element, as an occasion, on a DC skill furnish line while under pressure out from the provision to floor. it may also have a "severe bypass" , "DC Block" functionality while under pressure out from a sign source output to the enter of an amplifier as an occasion. while mated with a coil (inductor) the two have a frequency assembly factor that can functionality very severe or very low impedance to a chosen frequency, creating an exceedingly solid frequency bypass or frequency blockading circuit. Batteries can not do this.
2016-12-17 16:46:34 · answer #3 · answered by mckernan 4 · 0⤊ 0⤋
Why replace them? Batteries provide a much smaller solution to producing power. Caps that could function as batteries are too big.
2007-12-12 23:00:38 · answer #4 · answered by jimmy k 2 · 0⤊ 0⤋