HP LT CHARG 19V-4.74A DC 7.5*5.0MM 90 WA

Voltage (V): 19V This indicates the output voltage of the charger. In this case, it is 19 volts.
Current (A): 4.74A This represents the output current of the charger, measured in amperes. In this case, it is 4.74 amps.
DC (Direct Current): This means that the charger provides a direct flow of electrical charge.
Connector Size: 7.55.0mm This specifies the size of the DC connector that plugs into the laptop. The first number (7.5mm) likely refers to the outer diameter, and the second number (5.0mm) refers to the inner diameter.
Power: 90W This indicates the power rating of the charger, measured in watts. In this case, it is 90 watts.
So, in summary, the HP laptop charger you described is a 19V, 4.74A, 90W charger with a DC connector of 7.55.0mm. This type of information is crucial when selecting a replacement charger for an HP laptop, as using an incompatible charger can damage the laptop. Always make sure that the replacement charger has the same voltage, current, and connector specifications.