Voltage, Resistence, and Current.

During this lab, we were analysing how a circuit would be functioning. The picture describes at least four ways that a bulb could be lighted. In all the possibilities, the current flows normally, from the negative to positive, which is the way that must be done so humans can have lighting at home or office. The third scheme, at bottom from left to right, the bulb cannot be lighted because there is not current flow and the the potential difference between the negative side and the positive side cannot be verified. In this case the current will accumulate and there will be an increasing in the temperature. In a home circuit, this temperature rising would, probably, cause a short in the electrical circuit.

This picture gives in a few words how the a simple electrical circuits works, and it is like the one described above. The battery gives energy, the filaments at the bulb will resist to this flow and at same point it will produces light; after passing this resistance, the current will flow back to the battery and the cycle starts all over again. fro this to happen, electrons must flow from one side to another. And for this to a continuous flow, it must have in the circuit a potential difference that is verified when energy tries to pass through the bulb's filament. 

This picture shows that bigger in diameter a wire is, less resistance it will be presented. Lets use an analogous example. When we have a water pipe coming from a water facility treatment plant, it will be divided in various others pipes to reach each of our homes. But lets keep with three just. From the main pipe, we see it that has also two other pipes, one with a bigger diameter than the other one. Water, as humans, will choose the way with least resistance to make the water flow normally and do not cause major problems in the pumps. The same analogy is applied to wire and current flow.

This photo represents a simple circuit where the we have a battery, cables to make the current travel from the positive to the negative pole of the battery. In addition to the lam and battery, a voltmeter and a switch are also included to open or close, making possible that current can flow or not from one side to another. The voltmeter is the controler, like a border, that controls how much is traveling throughout the circuit.