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Mosfet gate left floating.

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tjw09003

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We are using n-channel mosfets for a h-bridge. When the gate is left floating why does my finger turn on the mosfet when it needs at least 4v across Vgs?
 

andre_teprom

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Static Electricity
Our body accumulate electrons while scratching not grounded objects.

+++
 

enjunear

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Static Electricity
Our body accumulate electrons while scratching not grounded objects.

+++

yup.
Add a large (1k-100k) pull-down resistor from gate to source (keeps the gate pulled low when not actively being powered).
 

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