Understanding Capacitor Charging Time

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SUMMARY

The discussion focuses on the process of solving capacitor charging time equations, specifically addressing the equation 0.7 - 1 = -e^t. The user struggles with logarithmic calculations, particularly with ln(-0.3), which is not defined. The conversation confirms that the procedure followed is correct, and the user seeks clarification on discrepancies in answers from previous problems.

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  • Familiarity with exponential functions
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  • Basic algebra skills
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Homework Statement



Please see the attachment
ok I am really not very good with this stuff at the moment. From reading the text I have gotten somewhere but have obviously screwed it up. ln -.3 doesn't exist obviously. Please help me with this. thanks

Homework Equations





The Attempt at a Solution


attempt can be seen in the same attachment as question. again I really need help with this..
 

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You have on the left side near to the end

0.7-1 = -e t

0.7-1 is -0.3

so you will end up with something like -0.3=-et. The -1s cancel.
 
oh ok thanks - is this the right procedure?
 
Yes it should be.
 
thanks - do you know what's going on with my other problem that we had different answers to?
 

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