ENERGY STORED IN A CAPACITOR-CLASS 12 PHYSICS (2nd method)

TABLE OF CONTENTS

CAPACITOR

The capacitor is a gadget for putting away electrical energy comprising of two conductors in neighboring and protected (insulated ) from one another.

PARALLEL PLATE CAPACITOR – IMAGE

WORKING OF A CAPACITOR

• Electrons from the adverse terminal(negative terminal) of the battery  will stream to the right plate of the capacitor and give their negative charges. The negative energizes expanding on the right plate will repulse the negative charges on the left plate.
• Those negative charges on the left plate will move towards the positive terminal of the battery leaving behind certain charges on the left plate.Here is the rearrangement of charges occurring according to Coulomb’s law.
• No current streams across the gap and the capacitor is supposed to be charged.

CURRENT THROUGH AMMETER  IS KEPT CONSTANT  

• At first, more electrons(more current) begin expanding on the right plate once the key is turned ON. For this situation, the resistance  of the rheostat is kept high to keep up with the current to a consistent level.
• These amassed (accumulated) electrons, presently begin repulsing further more electrons that are coming towarda the right plate. Presently the obstruction of the rheostat is kept low to keep up with the current to steady until the capacitor is completely energized(charged).
• For this steady current,the possible distinction (potential difference)across the capacitor is noted for customary time spans. A chart is drawn between  t  and  V
• Graph is a linear and we know that Q=It , here ‘t’ is roportional to ‘Q’ (shown in the image)
• ‘t’ is a proportion of the charge and subsequently energy put away is determined by plotting a diagram between Q  and  V. The inclination of the bend Is the Capacitance (C).

GRAPHICAL REPRESENTATION

ENERGY STORED IN THE CAPACITOR

Energy put away in the capacitor increments as charge increments and as the potential difference increments.

GRAPHICAL REPRESENTATION