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.
Here are some simple steps you can take to build a successful gravel pathway: Draw out your planned pathway-use chalk or spray paint to mark off the desired area. Line the edges of your pathway with bender board. Remove any soil needed. Laydown your & secure your weed mat. Add your course base gravel 2-3 inches thick. Compact with hand tamper or a Steel Plate Vibrator.