The series uses animation to help explain various aspect of how the subject devices function. The animation for the series was done by Hunkin himself in a uniquely recognisable format.

How does a vacuum cleaner work? And how about a sewing machine, a central heating system, a washing machine, a refrigerator, and a television set? The Secret Life of Machines (Series 1), consisting of the first six episodes of the series, focuses on explaining how these household appliances work.