# Explain why voltage transformations are related to conservation of energy (1 Viewer)

#### Axio

##### =o
Hey. So just like the title says, in what ways are voltage transformations related to the law of conservation of energy?

Thanks.

#### anomalousdecay

$\bg_white E = Pt$

Now here we refer to the energy input being as a function of power and time. For voltage transformations, we assume that the transformation is instantaneous here.

$\bg_white P = VI$

So power input and power output are equal.

$\bg_white P_1 = P_2$

$\bg_white V_1I_1 \ = \ V_2I_2$

____________

Now the question asks to explain this. Explain questions require you to state a cause, note the effect and give a reason for it happening.

I would answer the question as follows:

Cause - Law of Conservation of Energy

Effect - Relationship can be derived relating to output and input voltages.

Reason - Go through explaining in words and equations using the conservation of energy and why this leads to input and output power are equal, etc.

Note at the end that the equation and explanation you derived applies to 100% efficient voltage transformations as energy transfers which aren't part of the voltage transformation (example heat losses) results in power losses.

#### Axio

##### =o
$\bg_white E = Pt$

Now here we refer to the energy input being as a function of power and time. For voltage transformations, we assume that the transformation is instantaneous here.

$\bg_white P = VI$

So power input and power output are equal.

$\bg_white P_1 = P_2$

$\bg_white V_1I_1 \ = \ V_2I_2$

____________

Now the question asks to explain this. Explain questions require you to state a cause, note the effect and give a reason for it happening.

I would answer the question as follows:

Cause - Law of Conservation of Energy

Effect - Relationship can be derived relating to output and input voltages.

Reason - Go through explaining in words and equations using the conservation of energy and why this leads to input and output power are equal, etc.

Note at the end that the equation and explanation you derived applies to 100% efficient voltage transformations as energy transfers which aren't part of the voltage transformation (example heat losses) results in power losses.
Thanks!!! I found a 2004 thread which explained it quite well, hence why I deleted the thread . But ofc you explained it better.