A student sets up her circuit, for finding the equivalent resistance of two resistors ${\mathrm{R}}_1$ and ${\mathrm{R}}_2$ in series, in the manner as shown. She did not obtain the correct result in her experiment because of a mistake in her circuit. What mistake did she commit and what should do to correct this mistake? 

The given circuit diagram shows the experimental arrangement of different circuit components for determination of equivalent resistance of two resistors connected in series. Name the components $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ shown in the circuit.

For carrying out the experiment, on finding the equivalent resistance of two resistors connected in series, a student sets up the circuit as shown. On further verification, he finds out that the circuit has one or more faults. Mention the fault.

(i) The resistors $R_1$ and $R_2$ have not been correctly connected in series.

(iI) The voltmeter has not been correctly connected in the circuit. 

(iii) The ammeter has not been correctly connected in the circuit.

What will be the ammeter reading for the circuit shown in the figure? 

The diagram shows a network of four resistors which is connected to an electric source. Identify the resistors which are connected in series in this network.

The following instruments are available in a laboratory:

Milliammeter ${\mathrm{A}}_1$ of range $0-300 \mathrm{mA}$ and least count $10 \mathrm{mA}$.

Milliammeter ${\mathrm{A}}_2$ of range $0-200 \mathrm{mA}$ and least count $20 \mathrm{mA}$.

Voltmeter ${\mathrm{V}}_1$ of range $0-5 \mathrm{V}$ and least count $0.2 \mathrm{V}$.

Voltmeter ${\mathrm{V}}_2$ of range $0-3 \mathrm{V}$ and least count $0.3 \mathrm{V}$.

Out of the following pairs of instruments, which pair would be the best choice for carrying out the experiment to determine the equivalent resistance of two resistors connected in series?

Which is the correct setup for determining the equivalent resistance of two ${\mathrm{R}}_1$ and ${\mathrm{R}}_2$ connected in parallel and why?

Which two circuit components are connected in parallel in the following circuit diagram?