No, if there is no power, you do not need to unplug an electrical appliance from a circuit since it is already disconnected. When there is no power supply to an electrical circuit, all the devices and appliances connected to that circuit are effectively disconnected from the electrical source.
During a power outage or when an electrical circuit is switched off, the flow of electricity is interrupted, and the appliances within that circuit no longer receive electrical power. In such cases, there is no need to unplug individual appliances because they are already disconnected and not receiving any electricity.
However, it's important to exercise caution when the power is restored. It's advisable to wait until the power is stable and has been fully restored before plugging appliances back into the electrical outlets. This can help prevent potential power surges or electrical damage to the appliances.