تجهیزات صنعتی

Electricity is one of the oldest, most well-known and generally accepted fundamental forces. We usually talk about it in terms of electric charges, like electrons, protons and atoms which possess a positive or a negative charge. With electricity as the fourth most abundant element in the universe and present in everything, understanding electrical science can be an enlightening experience for kids ages 6 to 9. Through more than 50 colorful photographs and step-by-step instructions, Electricity shows how this invisible force creates and powers our world.

I guess I should start by explaining what electricity is. Oh sure, there is just one thing called electricity, but it comes in many forms. How about the electricity in your house? Or the electricity that runs a television or an elevator? And that"s only half of it: There is also the electricity that moves around inside your body! Electricity is the flow of charge. In order for electricity to flow there must be a source of charge, a path for the movement of this charge, and a closed circuit so that the charge can return to the source. Can you summarize these three components?

Electricity is the flow of electrons that a material will experience when an electric field is present. The presence of an electric field allows for electrical energy to exist as either static charges or as currents. Electricity is measured in units called volt, which measures how easily electrons are able to move through a conductor along a specific path.

Electricity is a physical phenomenon that deals with the presence, motion and interaction of charged particles. Usually, electricity has positive charge (such as protons) or negative charge (such as electrons). The presence of large quantities of positive or negative charges can produce electric fields.