1. When batteries are placed in an electrical item, why are they always required to place in alternate ways? That is, why does the first go in with positive end upwards, the next go in positive end downwards and so on?

The question came to me as I was replacing the batteries in my son's little speaker for his MP3 player.

2.

3. Originally Posted by Busy Bee
When batteries are placed in an electrical item, why are they always required to place in alternate ways? That is, why does the first go in with positive end upwards, the next go in positive end downwards and so on?

The question came to me as I was replacing the batteries in my son's little speaker for his MP3 player.
It is easier to make them with that arrangement. Less internal wiring required.

4. You are putting them in series to get a higher voltage. The total battery voltage is the sum of the voltage of each cell. This means the + of each cell is connected to the - of the next one in series. This is easily done if the two adjacent cells just touch the same piece of metal in the end of the battery compartment.

5. It is so you need to buy 2 batteries instead of just one. More profit that way.

6. If you look carefully, and think about it, you will see that the batteries form a chain, what we call 'wired in series'. So the - of each battery goes to the + of the next, and the + of the first battery and the - of the last battery feed the circuit. In this way the voltages add up, so if you have three 1.5 volt batteries, you will get 4.5 volts when they are wired in series.

You don't have to arrange the batteries alternately to wire them in series, but doing so does make it much easier to achieve. If you look in the battery compartment, you will probably notice metal contacts or double springs at each end between adjacent battery positions which will join the - of one battery to the + of the next.

OB

**WARNING if you ever jump-start your car, DO NOT join the car batteries this way. For that purpose, you must connect + to + first, then connect - to -
Disconnect the leads in the reverse order**

7. You're welcome. Don't mention it.

OB

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