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Hello everyone, today I am going to explain about electricity and electric circuit.

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First we have to note about electric current and it is the movement of electrical charges through a conductor.

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It is the flow of electrons through a circuit.

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So these electrons go from the negative point to the positive one, from the minus to the plus of a cell.

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At the same time, we can tell apart between direct current, which goes in one direction, and alternating current, that varies in value and direction.

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To do something useful with electric current, we need to put electrical components into the circuit,

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such as a cell, the energy source to supply the electric energy to the circuit,

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a conductor, like a wire, a receptor, for example a bulb to transform the electrical energy into light energy,

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and a control element, like a switch.

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There are several options to connect the receptors.

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The most important ones are series circuits, when the receptors are linked one after the other.

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The main drawback is if one of them is broken, none of them works.

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On the other hand, in parallel circuits, all the first terminals of the receptors are connected to one point

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and the second terminals are connected to another point, so if one of the receptors fails, the other works.

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This is the case of the appliances at home.

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To finish, one important content that we must learn is the Ohm law, and it says that current

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intensities is directly proportional to the voltage and inversely proportional to the

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resistance.

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So guys, I hope this explanation is useful to understand the elasticity unit.

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Bye bye.