# Why high voltage?

13 May 2014

- Previous Making Pyrex Invisible
- Next Is your head this big?

13 May 2014

- Previous Making Pyrex Invisible
- Next Is your head this big?

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## Comments

## think this is a magic trick.

think this is a magic trick.

## Give equations connecting

Give equations connecting heat loss due to higher voltage and higher current for same power supply

## How about you actually do

How about you actually do your homework yourself, and then ask us if we think you've done it right?

## It's Ohm's law. You can look

It's Ohm's law. You can look up the formula. Basically, you square current and multiply by resistance. So if you raise voltage, you lower current, and lower power loss by a factor of current squared. In other words, there is a logarithmic reduction in power loss when you increase voltage.

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