In general, appliances do not consume electricity when they are unplugged from the wall outlet. When an appliance is disconnected from the power source by unplugging it, the flow of electricity is interrupted, and the appliance should not draw any power.
However, there are a few exceptions to this rule. Some appliances, particularly those with clocks, timers, or standby features, may have small power supplies or components that continue to draw a minimal amount of electricity even when they are unplugged. This is commonly referred to as "standby power" or "phantom power."
These small power draws are typically very low compared to the power consumption when the appliance is actively in use. Nevertheless, over time, standby power usage from multiple devices can add up. To reduce standby power consumption, you can use power strips with switches to easily turn off multiple appliances at once or unplug devices that are not in use for extended periods.
It's worth noting that unplugging appliances when they are not in use can also provide protection against power surges, reduce the risk of electrical faults, and save a small amount of energy.