What is the resistance of an electric arc lamb when hot, if the lamp uses `20 A` when connected to a `200` volt line ?

Explanation

To find the resistance of an electric arc lamp when it is hot, we can use Ohm's Law, which states that:

\[ R = \frac{V}{I} \]

Where:
- \( R \) is the resistance,
- \( V \) is the voltage,
- \( I \) is the current.
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