650mA

650mA refers to a current measurement of 650 milliamperes. A milliampere (mA) is a unit of electric current equal to one-thousandth of an ampere (A). The ampere is the SI base unit for electric current, defined as the flow of one coulomb of charge per second. Therefore, 650mA represents a flow of 0.65 amperes of electrical current.

This specific current value is often encountered in various electronic applications and device specifications. For instance, it might be the operating current of a small electronic component, the charging current for a portable device's battery, or a fuse rating designed to protect a circuit from excessive current. The context in which 650mA is specified is crucial for understanding its significance. A device designed to operate at 650mA will function optimally when supplied with approximately this amount of current. If it receives significantly less, it may not function at all or may perform poorly. Conversely, if it receives much more current than it can handle, it risks damage or overheating.

In the context of power supplies and chargers, a 650mA output rating indicates the maximum current the supply can safely deliver. For example, a USB charger might have an output of 5V at 650mA, providing a power output of 3.25 watts (Voltage x Current). Understanding current ratings like 650mA is fundamental in electronics for ensuring proper device operation, safety, and compatibility between different components.