1 An electric current is the overall movement of charged particles in one direction. 2  To obtain an electric current, there needs to be a continuous circuit from one terminal of a battery to the other. 3  An electric current in a circuit transfers energy from the battery to the circuit components.
A pea gravel walkway or patio costs about $5 per square foot, installed, including a layer of base rock. If you'd like to install it yourself, it will cost half as much.Add in the cost of a header or Bender Board. A wood header is about $5 per linear foot; a metal header is $6 (black metal disappears well).You won't need a header if you're installing gravel against a house, fence, or raised bed.dd in the cost of a header or Bender Board. A wood header is about $5 per linear foot; a metal header is $6 (black metal disappears well). You won't need a header if you're installing gravel against a house, fence, or raised bed.
Concrete walkways are typically $5â$16 per square foot and often the least expensive. The cost rises to the $16 range when stamping and coloring is added to give the material a unique look. Brick. This choice usually costs $8â$12 per square foot and has an old-world charm. Paver. Paver walkways are often $10â$25 per square foot. Count on a quality paver walkway to last for 20 years or more. Natural stone. This walkway option is usually $18â$30 per square foot. Long-lasting with a natural appearance, stone walkways are at home in nearly any landscape. Learn more about garden paths.