yes hair wil have a resistance of some ohms
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Yes.
The higher the resistance the less current can pass through therefore the current will be lower.
Insulator. Like wood.
In a series circuit, current has to pass through each part of the circuit. In a parallel circuit, the current has several alternative paths.
If two circuit elements (e.g., two resistors) are in series (a series circuit), the current has to pass first through one, then through the other. If they are in parallel, the current has a choice, through which of the elements it passes.