Carbon resistors are commonly used to calibrate resistance.

A carbon resistance has the following colour code. What is the value of the resistance?

The Wheatstone bridge shown in the figure below, gets balanced when the carbon resistor used as $R_1$ has the colour code (orange, red, brown). The resistors $R_2$ and $R_4$ are $80 \mathrm{\Omega }$ and $40 \mathrm{\Omega }$, respectively. Assuming that the colour code for the carbon resistors gives their accurate values, the colour code for the carbon resistor, used as $R_3$, would be

The colours of a carbon resistor are yellow, violet, brown and golden respectively from left to right. If the corresponding numbers for the colours are $4, 7, 1$ and $5$. What will be the resistance of resistor?

$I-V$ characteristic of a copper wire of length $L$ and area of cross-section $A$ is shown in figure. The slope of the curve becomes

The colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is: