Calculating Load Current/Voltage at X

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SUMMARY

The discussion focuses on calculating load current and voltage at point "X" with load resistances of 1K and 10K ohms. Participants highlight the importance of assumptions in the calculations, particularly regarding the voltage divider input, which should be considered at -15V rather than 0V. The op-amp voltage supply is assumed to be +/- 15V, and the necessity of defining ground as zero volts is emphasized. Participants are encouraged to recalculate their results based on these clarified assumptions.

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  • Understanding of voltage dividers
  • Familiarity with operational amplifier (op-amp) configurations
  • Basic knowledge of electrical circuit analysis
  • Ability to make and justify assumptions in circuit calculations
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  • Study voltage divider circuits and their applications
  • Learn about operational amplifier configurations and their power supply requirements
  • Explore techniques for making justified assumptions in circuit analysis
  • Review methods for recalculating circuit parameters based on different assumptions
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Electrical engineering students, circuit designers, and anyone involved in analyzing or designing circuits with operational amplifiers.

mathman44
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Homework Statement



Calculate the load current and voltage at "X" when

Rl = 1K and Rl = 10K
 
Last edited:
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The problem requires you to make a lot of assumptions and I don't see how your answers can be counted wrong simply for making the wrong assumptions.

One mistake I see however is calculating the voltage divider input at +10 V. You must be assuming that the bottom of the divider is at zero volts instead of -15 V.

You're right that they don't give the voltages applied to the opamp but +/- 15 V is not an unreasonable value so let's assume that that is what it is. Another assumption you have to make is that ground is at zero volts. It almost always is but it doesn't have to be.

Recalculate it again and see what you get.
 
Ok thanks
 
Last edited:

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