Explanation:

Combination of two or more electric cells is called a battery. When electric cells are connected together, the total voltage and capacity of the cells increase. This allows the battery to provide a more sustained and higher amount of electrical energy.

Electric Cells:
An electric cell is a device that converts chemical energy into electrical energy. It consists of two electrodes - a positive electrode called the cathode and a negative electrode called the anode. These electrodes are immersed in an electrolyte solution, which allows the transfer of ions and facilitates the chemical reactions within the cell. When a load is connected to the electrodes, a chemical reaction occurs, and electrons flow from the anode to the cathode, creating an electric current.

Battery:
A battery is formed by connecting multiple electric cells in a series or parallel arrangement. The cells are connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next cell, and so on.

There are two common types of battery connections:

1. Series Connection:
In a series connection, the positive terminal of one cell is connected to the negative terminal of the next cell, and so on. The voltage of each cell adds up, resulting in a higher total voltage. However, the capacity remains the same as that of a single cell. This arrangement is commonly used in devices that require higher voltages, such as flashlights, remote controls, and electronic toys.

2. Parallel Connection:
In a parallel connection, the positive terminals of all the cells are connected together, and the negative terminals are also connected together. The voltage remains the same as that of a single cell, but the capacity increases. This arrangement is commonly used in devices that require longer battery life, such as laptops, mobile phones, and electric vehicles.

Conclusion:
In summary, a combination of two or more electric cells is called a battery. Batteries are used to provide a sustained and higher amount of electrical energy by connecting multiple cells together in series or parallel arrangements.

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