Q. 24.6( 53 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?
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 - Exemplar
Two batteries of emf ε1 and ε2 (ε2 > ε1) and internal resistances r1 and r2 respectively are connected in parallel as shown.
Physics - Exemplar