A model dam can be made from a few items normally already found in the kitchen. Use a Tupperware of similar plastic container, some sand, rocks and water to create a model of a structure that retains water.Know More
To make a model dam, PBS Kids recommends placing sand in the plastic container and digging a trench in the sand that resembles the shape of a flowing river. Pick a point along the trench to build the dam. Place small rocks on it and enclose them with Popsicle sticks that stand upright. Pour a little water down the trench to start the river to see if the dam is constructed well enough to withstand the flow but still allow some water to enter the structure.
Dams are sometimes associated with levees or floodgates. Both are used to control water flow. But levees are designed to prevent water from flowing into regions. The purpose of a dam is to retain water that may also be transferred to other locations. In addition to water retention, dams can help generate electricity with the help of hydro power.
Natural causes and wildlife such as beavers help form dams. Dams can also be man-made. Man-made dams are classified by several factors, including size, height, structure and purpose.Learn more about Electricity
Batteries are made from multiple electrochemical cells that convert stored energy into usable electrical energy. For commonly available disposable batteries, the cells can be a combination of carbon, lithium, magnesium, silver oxide, alkaline zinc–manganese dioxide or nickel.Full Answer >
An electrical wire ampacity chart can be found in the National Electrical Code Handbook, NFPA 70. The NEC Handbook is published by the National Fire Protection Association, an international non-profit organization. The NEC Handbook table 310.15(B)(16), Allowable Ampacities of Insulated Conductors, can be obtained as a downloaded document from NECConnect.org.Full Answer >
To make a solenoid, you need a hollow cylinder, a battery and lots of conducting wire. The wire must be wound dozens of times around the cylinder, with both ends connected to a battery. This allows the current to flow, replicating the effect of a bar magnet.Full Answer >
In general, metals make good conductors of electricity. These include copper, gold, silver and aluminum. Copper is a common conductor of electricity used in industrial applications because it is inexpensive to acquire, especially in comparison to gold and silver. Aluminium is not as efficient in conducting electricity as copper is.Full Answer >