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.
Expert Advice: To determine how much sand (or gravel) you'll need for a paver walkway, multiply the path length (in feet) by width (in feet) and then multiply by the desired depth of sand (in feet) to determine cubic feet. Divide by 27 to determine cubic yards.nstall a flagstone, gravel, or paver walkway in a weekend or less! Use these three DIY walkway ideas to add interest to your yard -- our easy how-tos walk you through every step of the process. 1  Facebook.