a. Rearrange the Ohm This is an electrical example from PHY S.204L/206L, potenti

Question

a. Rearrange the Ohm

This is an electrical example from PHY S.204L/206L, potential difference, DeltaV, versus current, I (Fig. 4). The theoretical equation is DeltaV = IR (Eg. 5) and is known as "Ohm's Law." The unit symbols stand for volts, V, and Amperes, A. The factor R stands for resistance and is measured in units of ohms, symbol Ohm (capital omega). The definition of the ohm is: Ohm = V/A (Eq. 6) By coincidence the letter symbols for potential (a quantity) and volts (its unit) are identical. Thus "voltage" has become the laboratory slang name for potential. Rearrange the Ohm's Law equation to match y = mx + b.. What is the experimental resistance? Comment on the experimental intercept: is its value reasonable?

Explanation / Answer

Ohm's law:

V = I * R

arranging in the form of y = mx + b,

V = RI + 0

where,

y = V, m = R, x = I, b = 0

Experimental resistance from the graph,

= slope of the graph

= 0.628 ohm

Experimental resistance is not reasonable because it is calculated by neglecting the internal resistance of the conductor,

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