$\"\"$

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The function is $\"\"$ , where $\"\"$ is the amount of current , $\"\"$ is the time, $\"\"$ is the resistance, $\"\"$ is inductance, $\"\"$ is an electromotive force.

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How long does it take to obtain a current of $\"\"$ ampere.

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Here, $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .

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Substitute all the above values in the equation $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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From the definition $\"x$ if and only if $\"y$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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The time is $\"\"$ take to obtain a current of $\"\"$ ampere.

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$\"\"$

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how long does it take to obtain a current of $\"\"$ ampere.

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Here, $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .

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Substitute all the above values in the equation $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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From the definition $\"x$ if and only if $\"y$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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The time is $\"\"$ take to obtain a current of $\"\"$ ampere.

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$\"\"$

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Graph :

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Graph the functions $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$