Batteries use powerful micro-technology to generate electricity. It is because the chemical they contained cause a chemical reaction. When the chemical reaction happens, electricity can be generated. In other words the battery becomes an energy source.
All batteries have a life time. It usually can only supply energy for a period of time. After this period the chemical used up and the reaction comes to an end. The batteries can no longer be used because there is no more electricity can be generated. However, for rechargeable batteries, the chemical are returned to their original state during the recharging process, so that the discharge can start again from the beginning.
The power of a battery is expressed in amperes (Ah) and the voltage is expressed in volts (v).
The chemical composition of a battery determines its voltage and the quantity of material (the size of the battery) determines its power (expressed in Amperes).
The power of a battery is important when it comes to making an appliance work, such as car batteries. This is because a sophisticated radio uses more energy than a simple travel alarm clock. The more demanding the appliance, the more power it needs to work. This also explains why some appliances make more space for batteries than others. Several batteries working together can deliver more power.
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