Yes, a toaster typically uses more electricity when baking toast compared to when it is turned on without any toast inside.
When a toaster is turned on without any toast inserted, it still consumes some electricity to power its heating elements and maintain the internal temperature, but the power usage is relatively low compared to when it is actively toasting bread.
When you put bread slices into the toaster for toasting, the heating elements have to work harder to raise the temperature of the bread and achieve the desired level of toasting. This increased heating demand results in higher electricity consumption during the toasting process.
The exact difference in electricity consumption between these two scenarios would depend on the toaster's power rating and the duration of toasting, but in general, toasting bread will use more electricity than simply having the toaster turned on without any toast inside. If you want to be more energy-efficient, it's a good practice to avoid leaving the toaster turned on when not in use and toasting only when you have bread to insert.