In general, it is not recommended to plug one electrical appliance into another electrical appliance that is switched off but still plugged in. The reason for this is that some appliances, even when switched off, may still have live electrical components or standby power consumption. Plugging one appliance into another in this manner can pose safety risks and may lead to unexpected electrical issues.
However, there are some specific cases where it is safe and feasible to plug one appliance into another, even if the second one is switched off but plugged in. One common example is using a power strip or surge protector with multiple outlets. In this case, you can plug one appliance into the power strip, and as long as the strip itself is not turned off or disconnected from the power source, the appliance will still receive power.
The reason this works is that power strips often have an integrated switch or circuit breaker that controls the flow of electricity to all the outlets. When you turn off the power strip, it effectively cuts off the electricity supply to all the appliances connected to it, regardless of their individual switches or power settings.
It's important to note that not all electrical appliances are designed to be plugged into others, and doing so may still pose risks. It's always advisable to consult the user manuals and follow the manufacturer's instructions for each appliance to ensure safe and proper usage.