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What is the v of two __battery 12v__ in series?

Two 12v batteries in series are 24v. Because DC battery, series = voltage increases, current does not change, parallel equals current increases, voltage does not change, so it is 12 volts.

series connection is one of the basic ways of connecting circuit components. It refers to a circuit connection in which the components or components of a circuit are arranged so that the current passes through each component or component without diverting. In a series circuit, the current across each resistor is equal, and the sum of the voltages at both ends of each resistor is equal to the total voltage of the circuit. We know that the voltage on each resistor is less than the total voltage of the circuit, so the series resistance voltage. In a parallel circuit, the voltages at both ends of each resistor are equal, and the sum of the currents on each resistor is equal to the total current (the main current). It is known that the current on each resistor is less than the total current (the main current), so the parallel resistance shunt. Series and parallel resistance is like water flow, series only one road, the larger the resistance, the slower the flow, the more parallel branches, the greater the current. If the battery is in parallel, the voltage is 12v, because the voltage of the parallel circuit is constant.