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Relative brightness in a circuit, and using modified Kirchhoff's

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Help with questions 8.2 and 8.9. Please see attached file for full problem descriptions.

8.2) Explaining the relative brightness in the given circuit.

8.9) Use the modified version of Kirchhoff's second rule to find the voltage across the bulb in the given circuit.

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Solution Summary

The solution determines the relative brightness in a circuit and uses Modified Kirchhoff.

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Please see the attached file.

Note that the brightness of bulb depends on power which equals to .
Each bulb has the same resistance.

The current through A equals while ...

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