Notepad/enter/Spark Gap Physics.md

The voltage and current relationship when a spark gap's gap is increased is as follows:

Voltage: The voltage required to initiate a spark across the gap increases
    as the gap widens. This is because the air in the gap has to be ionized
    before a spark can occur, and it takes more voltage to ionize the air as
    the gap widens.

Current: The current that flows through the spark gap after it has initiated
    is relatively constant, regardless of the gap width. This is because the
    resistance of the ionized air is very low, so a large current can flow even
    with a small voltage difference.

For example, spark gaps are used in spark-ignition engines to ignite the
fuel-air mixture. The spark plug in a spark-ignition engine has a gap of about
0.020 inches, and the voltage required to initiate a spark across this gap is
about 20,000 volts. However, once the spark has initiated, the current that
flows through the spark plug can be as high as 20 amperes.

The relationship between voltage and current in a spark gap is not linear.
As the gap widens, the voltage required to initiate a spark increases
exponentially. This means that a small increase in the gap width can result in
a large increase in the voltage required to initiate a spark.

The voltage and current relationship in a spark gap is also affected by the type of gas that is present in the gap. Air is the most common gas used in
spark gaps, but other gases such as argon and helium can also be used.
The breakdown voltage of a gas is the voltage required to ionize the gas,
and it is different for different gases. This means that the voltage required
to initiate a spark in a spark gap will be different depending on the type of
gas that is present in the gap.