Now consider a toaster. Its cord is plugged in.

Electricity travels along the cord and carries energy to the toaster. The toaster warms the bread.

Now consider a fan. Its cord is plugged in.

Electricity travels along the cord and carries energy to the fan. The fan's blades turn round.

Now consider a speaker. Its cord is plugged in.

Electricity travels along the cord and carries energy to the speaker. The speaker makes a sound.

Electricity carries energy along each cord. The toaster warms the bread, the fan's blades turn, the speaker makes a sound.