Answer to Question #287480 in Electric Circuits for djpoly

Question

plot a graph of voltage against current and find the slope, the slope you find from voltage to current is the resistance which is measured in ohm's.

the standard error on slope is given as 4(V2-V1)/6(12-11)

Answer 1

SAMPLE RESULTS

$\begin{matrix} Current (A)& &0.1&0.2&0.3&0.4 \\ Voltage (V)& &1.2&2.4&3.6&4.8 \end{matrix}$

Slope of the graph

$=\frac {\Delta V}{\Delta I}$

$=\frac{(4.2-1.0)}{(0.35-0.085)}=12.075\Omega$

As per equation given

Standard error$=\frac{4(V_2-V_1)}{6(I_2-I_1)}$

$=\frac{4}{6}×slope$

$=\frac{4}{6}×12.075$

$=8.05$