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Investigating in Sc. 4(Physics) Problem: Three different types of electrical components are hidden in "Black Boxes", my task is to identify each component by investigating its properties. The components are labeled A, B, C, and consist of a fixed resistor, a light emitting diode and a filament bulb. Which is which? Planing In each graph the current is reversed in the negative part of it. Ohmic Conductor: If a substance gives you a straight graph, like this one, this then will be an ohmic conductor. Ohm's Law: George Ohm discovered that the current flowing through a metal wire will be doubled (that doesn't apply on a lamp because it changes the temperature) Diode: You can notice that in the reversed direction there weren't any current, but when it is normal it increases. Filament Lamp: It is not an ohmic because the graph isn't straight and that doesn't obey ohm's law. As more current flows, the metal filament gets hotter and the resistance increases....

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