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of the bulb is connected to the – end of the battery by touching it directly. Thus current can flow through the bulb and it will light.

C

WILL NOT LIGHT. Both the tip and the side of the bulb are connected to the – end of the battery, the tip by touching it directly and the side by the wire. Neither part of the bulb is connected to the + end of the battery. Thus current cannot flow through the bulb and it will not light. (Note: the extra wire is actually a short circuit that connects the + and – ends of the battery directly – a high current will flow through this wire and it will get hot.)

2. Students in a class were trying to decide which was a better model for how electric current flowed in a circuit: the two flow model, in which current flows out of both the positive and negative ends of the battery and meets at the bulb; or the one flow model, in which current flows out of one end of the battery and travels all around the circuit, through the bulb, and into the other end of the battery. Below are representations of the two models.

TWO FLOW MODEL

ONE FLOW MODEL

a) Describe one good example of evidence from an experiment you did in class that would support either the two flow or the one flow model, but not both.

In a regular circuit connected like this, with the two sides of the bulb holder connected to the + and – ends of the same battery, the bulb lights

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