The internal resistance of the cell shown in the figure is negligible. On closing the key k, the ammeter reading changes from 0.25 A to `(5)/(12)` A, then what is the value of resistance `R_(1)` (in ohm) ?

An ammeter A, a voltmeter V and a resistance R are connected as shown in the figure. If the voltmeter reading is 1.6V and the ammeter reading is 0.4 A, then R is

In the circuit shown below, the ammeter reading is zero. Then, the value of the resistance R is

In the circuit shown below, the ammeter A reads 5 A and the voltmeter V reads 20 V The correct value of resistance R is

If the resistance R_(1) is increased (see figure), how will the reading of the ammeter and voltmeter change ?

In given figure the ammeter A reads 5 A and voltmeter V reads 40 V. The actual value of resistance R is

In the given circuit the internal resistance of the 18 V cell is negligible. If R_(1)=400 Omega and the reading of an ideal voltmeter across R_(4) is 5V, then the value of R_(2) will be :

In a circuit shown in figure if the internal resistances of the sources are negligible then at what value of resistance R will the thermal power generated in it will be the maximum. What is the value of maximum power?