Unplugging an appliance before the light goes off is generally not harmful to the appliance itself. The light turning off is often an indicator that the appliance is no longer drawing power and has been properly shut down. Unplugging it at any point during or after the light goes off will not cause any damage to the appliance.
However, there are a few considerations:
Power Surge: In some cases, if you unplug an appliance while it is still operating, you might experience a small electrical spark. While this is not necessarily harmful to the appliance, it's best to avoid it when possible, as it can lead to minor wear on the electrical contacts over time.
Data Loss (in some cases): For certain electronic devices or appliances with internal memory, like modern washing machines or digital clocks, unplugging them while they are running might cause loss of settings or data. In such cases, it's advisable to let the appliance finish its cycle before unplugging it.
Safety Precautions: If you are unplugging an appliance because it is malfunctioning or showing signs of damage, exercise caution. Unplugging a faulty appliance can be a good safety measure, but it's important to have the appliance inspected or repaired before using it again.
Standby Power: Some appliances consume a small amount of electricity even when they are turned off but still plugged in (known as standby power or vampire power). Unplugging them completely can help save energy and reduce your electricity bill.
In most cases, unplugging an appliance after it has been turned off (with the light indicator off) is safe and will not cause harm. If you want to minimize electrical sparks or if there is any doubt, you can wait a few seconds after turning the appliance off before unplugging it. Always use caution and follow safety guidelines when handling electrical appliances.