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### Re: Circuit Lab B/C

Posted: April 22nd, 2019, 7:28 pm
krasabnk wrote:Explain the mathematical difference between the Product of Sums and the Sum of Products procedures of Boolean expressions
`Think variables and complements`
`Products of Sums can be converted to Sums of Products by expanding. (A+B)(C+D) = AC + AD + BC + BD`

### Re: Circuit Lab B/C

Posted: April 22nd, 2019, 8:51 pm
UTF-8 U+6211 U+662F wrote:
krasabnk wrote:Explain the mathematical difference between the Product of Sums and the Sum of Products procedures of Boolean expressions
`Think variables and complements`
`Products of Sums can be converted to Sums of Products by expanding. (A+B)(C+D) = AC + AD + BC + BD`
I think that’s the general idea of conversion between the two. I just wanted the difference in definition and action between the two:
```The difference is how the input variables and their complements are perceived. For SOP, the product terms are summed via Boolean algebra and are based on the values of the inputs. If you have ABC, the complements for input value 001 would be A and B, while C is not a complement. For POS, the opposite applies, where give 001, your complement would be C.

I’m not familiar with the in depth comparisons between these two, but those explanations above are my general understandings.```
(Familiarized myself with this sort of terminology from the MIT invitational test release, so I’m not sure if this will match at all what will be on states or even nationals tests)
Bit of a sketchy question to ask, looking back, but nevertheless, your turn!

### Re: Circuit Lab B/C

Posted: April 23rd, 2019, 12:38 pm
What direction does the magnetic field point across a wire with current running into the page?

### Re: Circuit Lab B/C

Posted: April 23rd, 2019, 4:36 pm
UTF-8 U+6211 U+662F wrote:What direction does the magnetic field point across a wire with current running into the page?
`The magnetic field circulates clockwise around the wire.`

### Re: Circuit Lab B/C

Posted: April 24th, 2019, 12:55 pm
mjcox2000 wrote:
UTF-8 U+6211 U+662F wrote:What direction does the magnetic field point across a wire with current running into the page?
`The magnetic field circulates clockwise around the wire.`