ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: ssluffy on November 02, 2010, 10:42:48 pm

Title: transformers
Post by: ssluffy on November 02, 2010, 10:42:48 pm

just wondering, when it comes to transformers, if the current in the secondary is increased/decreased by changing the load resistance, what would the effect be on Power, Voltage and Current on the primary?

Can someone please clarify how the load affects the entire system? thanks.

Title: Re: transformers
Post by: Chavi on November 02, 2010, 11:29:24 pm

Current is Proportional to Voltage, so an increase/decrease in current on the load will result in an increase/decrease of voltage.
For Power it depends on a variety of factors such as Power loss (I^2R loss), energy consumption etc.

Is/Ip=Np/Ns
-This means that for a step up transformer, Ns>Np and Current is decreased during transmission (and voltage increased).

Is there a specific question that you need help with?

Title: Re: transformers
Post by: lachymm on November 03, 2010, 09:59:16 am

Chavi is correct however i believe that current it is INVERSELY "proportional to voltage" this means that as current increases by double the voltage must half and vice versa - assuming it is an ideal transformer (no power loss)

Title: Re: transformers
Post by: Chavi on November 03, 2010, 01:20:48 pm

Quote from: lachymm on November 03, 2010, 09:59:16 am

Chavi is correct however i believe that current it is INVERSELY "proportional to voltage" this means that as current increases by double the voltage must half and vice versa - assuming it is an ideal transformer (no power loss)

I was referring to current on the load - rather than what occurs in the step-up transformer (question was a little ambiguous).
But, ye - your explanation is absolutely correct.

Title: Re: transformers
Post by: ssluffy on November 03, 2010, 01:29:46 pm

can you please give an example, because this wasn't sufficiently taught by my teacher.