ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: kenhung123 on June 02, 2010, 05:32:02 pm

Title: Explain what happens?
Post by: kenhung123 on June 02, 2010, 05:32:02 pm

You know those questions that ask what happens to Vout when the resistance increase/decrease? I tend to always answer:
Resistance increase would cause decrease in current thus a decrease in Vout. So the trigger such as light intensity or temperature must decrease in order to maintain the same Vout.
Is that sufficient?

Title: Re: Explain what happens?
Post by: median on June 02, 2010, 07:43:28 pm

Just worth remembering V1/V2=R1/R2. Therefore an increase in the resistance of R1 results in an increase of the votlage (V1) across it. Dont really know what question you're refering to though

Title: Re: Explain what happens?
Post by: m@tty on June 02, 2010, 07:47:37 pm

I usually just say that to keep a constant voltage ratio an equivalent resistance ratio must be satisfied. Or vice versa. And then, of course, expand on it a little and apply it to the question.