Q. 24.4( 87 Votes )

# A battery of emf 10 V and internal resistance 3 W is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?

Answer :

The diagram is given as:

Given: Electromotive force (E) of battery = 10 volt.

Internal Resistance r of the battery = 3 Ω

Current in the Circuit (I) = 0.5 A

Let the resistance of the required resistor is R Ω

Let the Terminal voltage of the register be V.

As per Ω ’s law,

⇒

⇒

⇒R + r = 20 Ω

∵ r = 3Ω

Resistance of Resistor is 17 Ω.

Also, as per Ohm’s law,

⇒V = IR

⟹ V = 0.5A × 17Ω =

⇒ V = 8.5V

∴ Terminal voltage of the register is 8.5V.

Rate this question :

The plot of the variation of potential difference across a combination of three identical cells in series, versus current is shown below. What is the emf and internal resistance of each cell?

Physics - Board Papers

Draw a circuit diagram of a potential divider using a cell and a rheostat. Also mark the output terminals.

Physics - ExemplarConsider a capacitor-charging circuit. Let Q_{1} be the charge given to the capacitor in a time interval of 10 ms and Q_{2} be the charge given in the next time interval of 10ms. Let 10μC charge be deposited in a time interval t_{1} and the next 10 μC charge is deposited in the next time interval t_{2}.