In the following circuit,the battery has an emf of $2 \ V$ and an internal resistance of $\frac{2}{3} \ \Omega$. The power consumption in the entire circuit is $..... \ W$.

$A$ cell whose e.m.f. is $2\, V$ and internal resistance is $0.1\,\Omega$ is connected with a resistance of $3.9\,\Omega$. The voltage across the cell terminal will be ................ $V$.

If all resistors are of $9\, \Omega$,then the reading of the ammeter is .......... $A$.

$A$ constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

Four resistances $10 \ \Omega$,$5 \ \Omega$,$7 \ \Omega$ and $3 \ \Omega$ are connected to form the sides of a rectangle $AB$,$BC$,$CD$,and $DA$ respectively. Another resistance of $10 \ \Omega$ is connected across the diagonal $AC$. The equivalent resistance between $A$ and $B$ is ............. $\Omega$.

The current inside a copper voltameter: