Battery size is indicated by letter designation. AA, AAA, C and D batteries all differ in size. They are designed for use in different types of devices that run on batteries. AA and AAA batteries, like C and D batteries, carry the same amount of voltage. The difference, however, is in the way the voltage is delivered.
The most obvious difference between AA and AAA is its size. The AA cell battery is slightly longer than the AAA battery and is also somewhat wider. The C cell battery is larger than the AA battery, and the D battery is larger than the others.
Battery size determines the amount of current available. D batteries give more current than C batteries, and AA batteries give more current than AAA batteries. Due to the size difference in batteries, AAA batteries have a smaller amount of material than AA batteries. Appliances that require more energy have larger batteries.
AAA batteries are designed for use in small, low-power, mostly portable devices. Remote controls and clocks are typical examples. AA batteries are designed to be used in devices that consume more energy, such as toys that run on batteries and small electric torches.
According to the University of Physics Department of AA and AAA, as well as batteries type C and D of Illinois, all have 1.5 volts. Voltage is a measure of the electrical potential in a source. It is also the power supply of the battery of electricity.
The current is the flow of electricity through a conductor. It can be compared to the amount of water flowing through a pipe. The higher the current, the more water, nor electricity, is flowing. Some electrical devices need more current and larger batteries provide more current. Voltage and current are equally important factors in batteries and other electrical devices.