Why are we increasing the capacitor capacity

Capacitor & capacitance

Capacitors are arrangements with which charges can be stored. As a rule, they consist of two electrodes that are electrically isolated from one another, between which there is usually an insulating medium, the so-called dielectric. Great efforts are currently being made to increase the storage capacity of a capacitor. Using the plate capacitor as an example, the following examines the parameters on which the storage capacity of a capacitor depends.

Basic principle for all partial tests

If you charge a capacitor with a certain voltage \ (U \), there is a lack of electrons on one plate and an excess of electrons on the other. The amount of charge \ (Q \) is the same on both plates.

If you remove the capacitor from the power source and discharge it using a charge measuring device (e.g. ballistic galvanometer or a measuring amplifier set to charge), the charge deficiency and charge excess balance each other out, the charge \ (Q \) flows.

Construction and implementation of all partial tests

The lower plate is connected to the common earth via the electrical source and the measuring amplifier.

The upper plate is first charged by touching it with the charging contact 1, which is connected to the positive pole of the energy source. The plate is then discharged via the charge-sensitive measuring amplifier by touching the measuring contact 2, which is connected to the input of the measuring amplifier.

The sensitivity of the measuring amplifier should usually be set to the range of \ (10 ​​^ {- 8} \, \ rm {C} \).

Tip: A high level of humidity has a strong influence on the success of the experiments. "Blow-drying" the plates and spacers with a simple blow dryer usually solves the problem.