How are electric fences “safe” considering the high voltage? And why is the high voltage necessary?

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I understand basically that the current, or amps, are what cause harm, but based on Ohm’s law, V=IR, for the amps to be so low with such high voltage, the resistance must be very high. So why do you need such a high voltage in the first place? Wouldn’t that require a transformer to step up the voltage? And doesn’t such a high voltage create a safety risk, for instance if a conductor with lower resistance came into contact with the voltage source? If you want low amps as not to electrocute animals/people, would it not be easier to use lower voltage?

Just curious and trying to understand. Electricity is like magic to me.

In: Physics

15 Answers

Anonymous 0 Comments

There is also some design functionality at work here, it is not just about 10K Volts…it is how it is created and what the circuit is.

It is not like you are connecting to a 10KV battery – or any real source of POWER.

The circuit, not unlike a spark plug circuit for a car, is making high voltage pulses, that do not have the capability to deliver much current.

Like getting a strong static shock – the voltage can be incredibly high, but there is not enough energy stored to injure you ( unless the system is large and can store a large amount of energy – like a thunderstorm)

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