A potentiometer has an uncertainty of $\pm 0.0001 \mathrm{V}$. If it is used to measure current through a standard resistance of $\text{0.1}\pm \text{0.001}\text{ \%}\mathrm{ \Omega }$ (uncertainty). The voltage across the resistance is measured to be $0.2514 \mathrm{V}$. What is the percentage uncertainty in the measurement of current?

The figure shows a simple potentiometer circuit for measuring a small emf produced by a thermocouple. The meter wire $PQ$ has a resistance $5 \mathrm{\Omega }$ and the driver cell has an emf of $2 \mathrm{V}$. If a balanced point is obtained $0.600 \mathrm{m}$ along $PQ$ when measuring an emf of $6.00 \mathrm{mV},$ what is the value of resistance $R$?

In a potentiometer experiment, a standard cell of emf $1.1 \mathrm{V}$ is balanced at $2.20 \mathrm{m}$ length. Potential difference across a resistance wire is balanced at $95 \mathrm{cm}$ length and voltmeter read this potential difference as $0.5 \mathrm{V}$. Then, error in the voltmeter will be,