# Tag Info

1

I think you are confused between potential difference and energy. The energy used up can vary, if the current flowing through the resistor varies. First of all, a battery is 'not' a constant energy source. It's a constant potential source. Secondly, if more current flows, more energy is dissipated, even though the per capita energy is constant. Now, to ...

2

Happy birthday. Once upon a time, there was a king and he had a sister who also liked coffee... Or let me omit this portion of the answer. A battery is motivating the electrons to buy a round trip ticket around the circuit by the voltage $V$. The voltage is nothing else than the energy $E$ per unit charge $Q$, i.e. $V=E/Q$; the unit 1 volt is nothing else ...

4

Consider for a moment, a cell that is not connected to a circuit, i.e., there is no path for current external to the cell. The chemical reactions inside the cell remove electrons from the cathode and add electrons to the anode. Thus, as the chemical reactions proceed, an electric field builds between the anode and cathode due to the differing charge ...

1

As I recall some models of Samsung phones display the same message but many phones don't. My Nexus 5 does not and my LG tablet does not. Modern phones use lithium batteries. It is important that these are not overcharged because this degrades the batteries by forming deposits of metallic lithium. However all modern phones will automatically stop charging as ...

0

Every action performed by a battery is as a result of a series of chemical reactions.Inside a battery there might be a setup for electrolytic or electrochemical cell reactions.So the durability of a battery depends on the type of electrodes and electrolytes used and their longevity.Mobile phones in general use Lithium ion batteries. You may consult the ...

2

Check out this post over at NASA. It's directed towards kids but it gives a good overview. Most relevantly, "In space, batteries must work in both very hot and very cold conditions. They must withstand a lot of radiation from the Sun. They must work in a vacuum without leaking or blowing up! They must be rugged enough to withstand the severe vibrations ...

Top 50 recent answers are included