# Potential vs. Current Graph

## Homework Statement

On my potential vs. current graph for resistors in parallel, the slope of the regression line is 8.94 ohm (V/I = R) for a 10 ohm resistor and a 50 ohm resistor. The theoretical value of R_eq is R_eq = 1/[(1/50 ohm) + (1/10 ohm)] = 8.33 ohm. Upon comparing the two R_eq values, I was wondering why the experimental R_eq value is higher than theoretical value. What sources of error could account for this deviation? (Oh, the regression line's y-intercept value is close to 0; it is 0.004 V.)

See above.

## The Attempt at a Solution

See above.

Thanks.

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Hootenanny
Staff Emeritus
Whats the error on your instruments? Whats the error on your resistors? You answer is with $\pm 7$%, which is pretty good if your using high school equipment.