Extra information about capacitors | class 12 Physics | advguruji | Physics Advocate

Extra information on capacitors

Q:1

Why there is low potential difference between the two conductors of a capacitor?

Ans. As we know,

             C = q/V

So, for large capacitance of a capacitor and large amount of charge storing in a capacitor, V must be low.

Also, in practicality if 'V' is large it will be result to a strong electric field between the conductors which can ionize the medium between the conductors resulting to acceleration in the charges towards the opposite charges and the charges inside the capacitor can fully or partially leaks away.

Q:2

What is a capacitor?

Ans. A capacitor is an energy storing device which stores energy in the form of charge hold inside the capacitor.

Q:3

What is dielectric strength?

Ans. It is the maximum amount of electric field of a dielectric medium so that the medium will not ionize. For example,

dielectric strength of air = 3 × 10⁶ N/C.

Pyaare bacchon, tumhari help k liye mene video daali hai

Q:4

List some uses of capacitors?

Ans. Uses of capacitors -

1. Capacitors are used to provide supporting torque in various rotating appliances like fans, coolers, etc.

2. The main use of capacitors is for storing energy to provide sudden energy flash in circuits.

3. Capacitors are used in timing circuits because of their periodic charging and discharging. For example, the beep beep sound in alarm clocks is due to capacitors in the internal circuit.

Q:5

What are the common units of capacitance?

Ans. The common units of capacitance are - micro farad(μF), nano farad(nF), pico farad(pF) because 1 Farad is a very very big unit of capacitance.

This is the video about introduction to capacitors   CLICK HERE

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