No, the net charge in a battery is zero! There is no surplus or missing charge at either terminal. I thought BAT1's positive terminal has a deficiency of electrons while BAT2's negative terminal has an excess of electrons. How come in Figure 2a there is no current flowing between the positive terminal of BAT1 and the negative terminal of BAT2. That's because no current is flowing as in Figure 2a. BAT3 is short-circuited while BAT4 is not.īut I don't notice heat or explosions or anything like that when I connect batteries in series. (b) Attempted series-connection of two grounded batteries would result in a short-circuit as the current could flow through the ground connection as indicated by the red arrow. (a) No short-circuit occurs when the batteries are properly connected in series. If the resistance is low then high currents will flow.įigure 2. The short-circuit is bypassing the lamp and providing a "short-cut" between the terminals of the battery. Here the intended circuit is the loop consisting of the battery and lamp. A short-circuit is usually defined as an unintended bypass of the intended circuit. When you connect two batteries in series, why doesn't the middle short? The connection between the positive terminal on one battery and the negative terminal on the other battery has no load, so shouldn't it be shorted?įigure 1. Simulate this circuit – Schematic created using CircuitLab In addition, the batteries are lumps of metal and able to take a lot of heat without a significant temperature rise.īoth is why the bumper-to-bumper connection stays considerably cool during an outer short circuit. ![]() The outer wire resistance \$R_w\$ be 0.1Ω instead because the wire is a longer and thinner conductor than the bumper-to-bumper contact.īecause \$P=I^2\cdot R\$ for each individual connection, and \$I\$ being identical in both "resistors" as they are part of the same loop, this means there is ten times more heat produced in the wire than in the bumper-to-bumper connection. Where the batteries are connected bumper-to-bumper, you have a very low resistance \$R_b\$ of maybe 0.01 Ω. However, there is no current flowing, as this requires a circuit -a closed loop- so obviously, B does not imply A.Īs soon you connect the plus from the other battery to the minus of the first also, there is a closed loop, and your short of the second kind grows into a short of the first.ĮDIT: There was some confusion about the heat production as well, which I explained in the comments before. ![]() When you connect the plus from one battery to the minus of the other, you have a short of the second kind. Using the same term a short for both makes you think they are equal, which they are not. Electric golf carts often use 6V, 8V, or 12V batteries connected in series to produce a total of 36 or 48 volts.Your problem is there are two definitions for the phrase a short:Ī) A short is high current flowing through a wire unintentionally.ī) A short is two places connected by a low-resistance interconnection (as a wire).īoth are correct but as much as A implies B, this does not mean B implies A. In this situation, you would use a charger that satisfies both 12 volts and 100 amp hours. When charging your battery, it is necessary to account for the total voltage of the string.įor example, if you have (2) 100 amp hour, 6 volt batteries connected in series, the total voltage is 12 volts and the amp hour capacity of the assembly is 100. In a series connection, the individual battery voltages are added together. Run your positive wire off of the open connector from the first battery and your negative off of the open connector on your second battery. To make a series connection between batteries, use a jumper wire between the negative of the first battery and the positive of the second battery. What do these terms mean and how do they influence what charger you need? When discussing batteries that are connected in either series or parallel, it is important to take into consideration the proper charger select that should be made when charging your battery. You’ve probably heard the terms “series” and “parallel” before. Sealed Lead Acid UPS Battery BackUp Batteries.Sealed Lead Acid Mobility Scooter Batteries.Sealed Lead Acid Lithium Rechargeable Batteries.Sealed Lead Acid Emergency Lighting Batteries.Sealed Lead Acid Deep Cycle Marine Batteries.Sealed Lead Acid APC RBC Replacement Batteries.Chargers Storage
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