An average smart phone user may not understand what is current and an ampere is a unit of current. Power is specified in watts because a watt is a unit of power. Appliances made for use in homes are designed to run on the AC mains supplied by utilities.
The amount of current in a battery depends on the type of battery, its size, and its age. A AA battery typically has about 2.5 amps of current, while a 9-volt battery has about 8.4 amps of current. Batteries produce direct current (DC). The electrons flow in one direction around a circuit.
The voltage of a battery is synonymous with its electromotive force, or emf. This force is responsible for the flow of charge through the circuit, known as the electric current. battery: A device that produces electricity by a chemical reaction between two substances. current: The time rate of flow of electric charge.
To determine if a battery is rated in watts or amperes, consider the nature of the load you want to power. If the load's current draw is independent of battery voltage, you'll be interested in battery capacity expressed in Amp hours. However, if the load uses constant power, then its current will depend on battery voltage, making battery capacity expressed in Watt hours more useful.
A battery produces an electric current when it is connected to a circuit. The current is produced by the movement of electrons through the battery’s electrodes and into the external circuit. The amount of current produced by a battery depends on the type of battery, its age, and its operating conditions. Is a Battery AC Or DC Current?
Most batteries produce direct current (DC). A few types of batteries, such as those used in some hybrid and electric vehicles, can produce alternating current (AC). Batteries produce DC because the chemical reaction that generates electricity inside the battery only flows in one direction. This unidirectional flow of electrons creates a DC circuit.