Question
Explain from where does the dissipated power in the resistor come form. 
###
Write a short note on electric cell.

Answer

→Electric cell :
We need an external source to keep a steady current through the conductor.

Image
This external source supplies the required power. To explain this a, simple circuit with a cell is shown in the figure.
As shown in the figure, when external resistor is connected with a cell, the energy is dissipated in the form of heat across the resistor. This energy comes from the chemical energy of the cell.
As long as this cell supplies chemical energy to the circuit, the circuit receives power.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

You are driving a motorcycle on a horizontal road. It is moving with a uniform velocity. Is it possible to accelerate the motoreyle without putting higher petrol input rate into the engine?
Can a plane mirror ever form a real image?
A potential difference $V$ is applied across the ends of a conductor of length $L$ and diameter $D$. What will be the effect on drift velocity of charge carriers in the conductor when (i) V is made half (ii) L is doubled and (iii) D is made half?
A ray PQ incident normally on the refracting face BA is refracting in the prism BAC made of material of refractive index1.5. Complete the path of ray through the prism. From which face will the ray emerge? Justify your answer.
Find the wavelength of electromagnetic waves of frequency 5 × 1019Hz in free space. Give its two applications.
In measuring time period of a pendulum, it is advised to measure the time between consecutive passage through the mean position in the same direction. This is said to result in better accuracy than measuring time between consecutive passage through an extreme position. Explain.
A short bar magnet of magnetic moment $m = 0.32 JT^{–1} $ is placed in a uniform magnetic field of $0.15 T$. If the bar is free to rotate in the plane of the field, which orientation would correspond to its $(a)$ stable, and $(b)$ unstable equilibrium? What is the potential energy of the magnet in each case?
A parallel plate capacitor is charged with a potential difference 50 V . Thereafter it is discharged by a resistor for 2 sec , due to which its potential decreases by 10 V . Calculate the portion of energy stored in the capacitor.
A circular road of radius 50m has the angle of banking equal to 30°. At what speed should a vehicle go on this road so that the friction is not used?
Elemental semiconductor and compound semiconductors. Explain with examples.