# Voltage across an inductor

1. The voltage v across an inductor L, in LR electrical circuit drops exponentially over time t (s). The relationship is:

See attached.

Where the emf, E, and τ are constants. Use the table of values for t and v and logarithms to plot an appropriate straight line graphs.

See attached for table.

Use your graph to estimate the values of E and τ. How long did it takes to half the initial voltage?

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#### Solution Preview

See the attached file.

Take logarithm to get,

lnV = -t/tau + lnE

This is in the form of y ...

#### Solution Summary

Given the values for time t and voltage v, a graph is plotted to estimate the values of emf and tau, a constant.

$2.19