In the circuit shown in Fig.4.20 both the ammeter and the cell have negligible resistance. Three external resistors are identical. When the switch S is opened, the ammeter reads 0.6 A. What will the ammeter read when the switch S is closed ?

(a) Explain with the help of a labelled circuit diagram, how you will find the resistance of a combination of three resistors of resistances R_(1),R_(2) and R_(3) joined in parallel. (b) In the diagram shown below, the cell and the ammeter both have negligible resistance. The resistors are identical. With the switch K open, the ammeter reads 0.6A. What will be the ammeter reading when the switch is closed?

In the given figure when the key is open the ammeter reading is 5 amp. What will be the ammeter reading when the key is closed

In the circuit shown above, when then switch S is closed,

In the circuit shown in Fig. 6.50 , an idel ammeter and an ideal voltmeter are used. Whan the key is open, the voltmeter reads 1.53 V . When the key is closed, the ammeter reads 1.0 A and the voltmeter reads 1.03 V . The resistance R is

In the circuit shows in Fig. 6.41 , the reading of the ammeter is (assume internal resistance of the battery be to zero)

In the adjacent circuit the ammeter reads 5.0 A and voltmeter reads 20V. The value of 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