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HOME / Why does ordinary battery have no current - RADIO-ENERGY
The easiest way to think of it is this: Current will only ever flow in a loop, even in very complex circuits you can always break it down into loops of current, if there is no path for current to return to its source, there will be no current flow.
The current is I = V/R, where V is the source EMF of the battery or power supply, and R is the sum of the internal and external resistances. The V you measure across the wire is the small voltage that you get with the overall current I flowing through the
It''s hard to sure without the context, but I''d guess that the definition is given that way because all batteries have a non-zero internal resistance, Ri R i, so if a current I I is flowing the measured voltage is E − IRi E − I R i where E E is the EMF of the battery.
I''ve heard that it''s because of that batteries don''t have electrons. It''s just the chemical reaction between anode and cathode that electrons from the anode travel to the cathode.
The internal resistance can be used to describe why an AA battery is incapable of generating an arbitrary amount of power; the more current that the battery creates, the more the voltage across the internal resistor drops according to Ohm''s_law (V=IR).
With some batteries the current should be artificially limited to protect the battery from self-destruction. It may be able to produce a high current for a short time and then chemical products build up that limit the current ("polarization").
Yes, a battery can have voltage but no amps. This occurs when the battery is in an unloaded state. Under load, voltage can drop and limit current delivery.
A lead-acid battery can have voltage but no current due to several reasons related to its internal condition or external connections. Here are some common causes.
I have a query. Suppose, I have a battery. Can some battery have enough voltage but not deliver the required current? How is this possible? My question comes from car batteries but it is not limited to automotive. It is batteries in general. I have seen, some car batteries holding like 10V, but the car does not start-up.
Yes, a battery can have voltage but no current. This happens in an open circuit. Here, the battery shows voltage, but no load is connected to draw current.