16 You are given a battery, a flashlight bulb, and a single...

16 You are given a battery, a flashlight bulb, and a single piece of wire. Draw at least two configurations of these items that would result in lighting up the bulb, and at least two that would not light it. (Don't draw schematics.) If you're not sure what's going on, borrow the materials from your instructor and try it. Note that the bulb has two electrical contacts: one is the threaded metal jacket, and the other is the tip (at the bottom in the figure). [Problem by Arnold Arons.] 17 You have to do different things with a circuit to measure current than to measure a voltage difference. Which would be more practical for a printed circuit board, in which the wires are actually strips of metal inlaid on the surface of the board?

Transcript

00:03 Okay, so here we have a few items.

00:10 We have wire, a battery, and a bulb.

00:13 And they want us to draw two configurations that would light the bulb and not light the bulb.

00:23 So in order to do this, we need to understand that in order to, for the bulb to light up, it needs to be a part of a complete circuit closed circuit so in order for the bulb to be lit it has to be part of a closed circuit and then one way you can do that is if you take the battery all right and you let's say you put the bulb maybe you put the part of the bulb there on the end of the battery there's the threaded part and there's the bulb.

01:06 And let's say you take your wire and you connect it to the other end and you put the wire, you connect it to the threaded end.

01:14 So we have that.

01:15 That would cause the bulb to light because you have electricity now flowing through the bulb in one complete path there.

01:27 You're not jumping across any part of the bulb.

01:31 It says that the bulb has two electrical contacts.

01:39 It says a threaded metal jacket is one of those electrical contacts, and the other is the tip at the bottom of the bulb there.

01:49 So we've got each contact connecting to a different part of the circuit there, and the battery is also part of that.

01:56 So that would light up.

01:58 Another way we could do this is we could take the battery and turn it upside down if we wanted.

02:04 And we could lay the bulb on its side, maybe down here.

02:09 So there's the threaded part connected to the bottom of the battery.

02:13 Here's the bulb.

02:14 And now we have the, let me see if i can make that a little bit clearer.

02:19 We have that electrical contact down there at the tip.

02:23 We're going to connect that up there to the wire.

02:26 That would be something that you could say would light the bulb.

02:31 That would light the bulb.

02:35 Okay, so those are two configurations that would cause the bulb to light up...

Question

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