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If they give you a circuit diagram with a bunch of different switches (let's say S1, S2, S3, and S4) and light bulbs (let's say L1, L2, and L3), and they say "If switch S1 is closed, what are the conditions of lamps L1, L2, and L3" we should assume that S2, S3, and S4 are open, correct?

blue cobra wrote:If they give you a circuit diagram with a bunch of different switches (let's say S1, S2, S3, and S4) and light bulbs (let's say L1, L2, and L3), and they say "If switch S1 is closed, what are the conditions of lamps L1, L2, and L3" we should assume that S2, S3, and S4 are open, correct?

I would suggest asking the proctor what they mean by that just so that there is no chance to lose points

I did at Regionals, but they said they couldn't tell me.

if they wouldn't tell you than yea assume that everything else is open
it was a group of parallel correct?

Ok that's what I was thinking. Thanks.

For Regionals imagine a parallel circuit with 3 branches. One switch was in series, so it controlled the whole thing. Then there was a switch on each branch. As well, the last branch was further broken into two branches in parallel, with one lamp on each. The switch on this branch was positioned such that it controlled both lamps. So for Regionals there were 4 lamps and 4 switches.

Also, has anyone actually seen Kirchoff's Laws and combo circuits on a test? This event just seems way too simple. It's got me paranoid

they say "If switch S1 is closed, what are the conditions of lamps L1, L2, and L3" we should assume that S2, S3, and S4 are open, correct?

You should assume each switch is as drawn in the diagram(except for those where they state the condition in the problem). If a switch is drawn closed, you should assume it is closed, If it's drawn open, assume it's open.

blue cobra wrote:Ok that's what I was thinking. Thanks.

For Regionals imagine a parallel circuit with 3 branches. One switch was in series, so it controlled the whole thing. Then there was a switch on each branch. As well, the last branch was further broken into two branches in parallel, with one lamp on each. The switch on this branch was positioned such that it controlled both lamps. So for Regionals there were 4 lamps and 4 switches.

Also, has anyone actually seen Kirchoff's Laws and combo circuits on a test? This event just seems way too simple. It's got me paranoid

I've seen "theoretical" combination circuits, where they ask you what the combined resistance would be if you combined a parallel circuit with one resistance and a series circuit with two resistance.

But that was like, the bonus.

I'd imagine combined series/parallel circuits are quite common...but maybe they're grossly simplifying the event...

Could someone please explain the wye and delta arrangements? They seem common on old Circuit Lab tests. Even if they are not those specific arrangements, I'm very insure of how to go about solving for things like that. A fine example would be in Section 2 of this test, the answer key for which can be found here. I have no idea how they got those answers. I'm also very unsure about questions about voltages between terminals. Any help in these areas would be appreciated.

And there aren't going to be capacitors in this event, are there?

I'm new to Shock Value, and only know VERY VERY basics. But how much about magnetism do we need to know?