In an experiment to find the equivalent resistance of a series combination of two resistances of $3\ \Omega$ and $4\ \Omega$ in the circuit diagram given. The circuit will give:

The given circuit diagram is a series combination of two resistances of $3\ \Omega$ and $4\ \Omega$. In a series combination, the current flowing through each resistor is the same, and the voltage across each resistor is different. The equivalent resistance of the combination is the sum of the individual resistances, which is $3\ \Omega + 4\ \Omega = 7\ \Omega$. Therefore, the circuit will give correct readings for both voltage V and current I.