Rc Helicopter Parts For Sale

Battery Voltage

Battery Voltage?

Does the voltage of a battery decrease as it is used.

It does decrease, but the rate of decrease varies with the type of battery. With an alkaline or carbon-zinc battery, the voltage goes down fairly quickly as the power is expended. For a Ni-Cd or Ni-MH rechargeable, it drops just a little, until the battery is almost dead, then it drops very quickly. Also, as the battery gets used up, its internal resistance goes up. That limits the amount of current it can deliver, even though it may have adequate voltage when not connected to a load. The circuit diagram below is for a real-world battery. The battery symbol represents an ideal voltage source, ie, one that can deliver any amount of current, without a drop in voltage. The resistor is the internal resistance of the real battery. With a fresh battery, the value of the resistance is very low, say, around 0.1 ohm for an alkaline "D" cell. If such a new battery were shorted out, it would put out ~15 A (from Ohm's Law, I = V/R, 15 = 1.5/0.1). As the battery is used, that resistance goes up. In a nearly dead battery, it might be 100 ohms, so the short circuit current would be 15 ma (0.015 A).

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