If `emf` of battery is `100V`, then what was the resistance of Rheostat adjusted at reading (`i=2A`, `V=20V`)

In the circuit shown below, each battery is 5 V and has an internal resistance of 0.2Omega. The reading in the ideal voltmeter V is __________V.

in the circuit shown in the figure, each battery is of 5 V and has an internal resistance of 0.2 Omega What is the reading of the ideal voltmeter V

emf of battery is 2.2 V. When 5 Omega resisitor i connected across the battery, its termina voltage is 1.8 V. In tern al resistance of battery .... Omega .

The circuit of a carbon are lamp is shown in the figure (to ignite the lamp the carbon electrodes are touched together, then they are slowly drawn apart). The voltage across the gap between the carbon rods as a function of the current can be given by the following formula : V=A + B//I , where A and B are constants. If the voltage of the battery V_0 can be considered constant what is the maximum resistance of the rheostat R_max , that should be connected in series to ignite the lamp. Data: A=40V, B=20W, V_0 =100V

A voltmeter is connected across a battery of emf 12 V and internal resistance of 10 Q. If the voltmeter resistance is 230 Q, what reading will be shown by voltmeter?

The internal resistance of a battery of 100 V is 5 Omega . When the emf of the battery is measured by a voltmeter 20% error is found. What is the resistance of the voltmeter?

A 100V battery has an internal resistance 3 Omega . What is the reading of a voltmeter having resistance 200 Omega , when placed across the terminals of the battery? What should be the minimum value of the voltmeter resistance so that the error in finding the emf of the battery may not be more than 1%?

In the figure shown, battery 1 has emf =6V and internal resistance = 1Omega. Battery 2 has emf =2V and internal resistance =3Omega. The wires have negligible resistance. What is the potential difference across the teminals of battery 2 ?