In the circuits shown below, the readings of voltmeters and the ammeters will be:

For ideal instruments:Ideal Voltmeter has infinite resistance ($R=\infty$).Ideal Ammeter has zero resistance ($R=0$).In Circuit 1: $i_1=10/10=1\text{A}$. $V_1$ (voltage across resistor) $=10\text{V}$.In Circuit 2: Since the voltmeter is ideal, it draws no current. The current $i_2$ in the main loop is determined by the $10\Omega$ resistor: $i_2=10/10=1\text{A}$. The voltmeter $V_2$ across the resistor will read the full battery voltage: $V_2=10\text{V}$.Thus, $V_1=V_2$ and $i_1=i_2$.