What is the capacitance of this device?

In summary, capacitance is the ability of a device or material to store an electrical charge and is measured in farads (F). It can be calculated by dividing the stored charge (Q) by the potential difference (V) using the formula C = Q/V. Factors such as distance between conductors, surface area, and material type affect capacitance, as well as the dielectric constant of the material between conductors. Capacitance is important in electronic circuits, as it allows for the storage and release of electrical energy, and is measured using specialized equipment or by using the capacitance formula with charge and potential difference measurements.
  • #1
sci0x
83
5
Question
An automatic external defibrillator (AED) delivers 125J of energy at a voltage of 1050V. What is the capacitance of this device?

Possible Ans
Capacitance is charge / voltage.
We have the voltage so how can you get a value for charge?
 
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  • #2
Do you know the formula for energy stored in a capacitor?
 
  • #3
oh ok,
so U = 0.5qV
so q = 0.238 V

Fill into capacitance formula and i got 2.267 x 10^-4 C/V
Thanks
 

What is capacitance?

Capacitance is the ability of a device or material to store an electrical charge. It is measured in units of farads (F).

How is capacitance calculated?

Capacitance can be calculated by dividing the charge stored (Q) by the potential difference (V) across the device. This can be represented by the formula C = Q/V.

What factors affect capacitance?

The capacitance of a device is affected by several factors, including the distance between the conductors, the surface area of the conductors, and the type of material used for the conductors. It is also affected by the dielectric constant of the material between the conductors.

Why is capacitance important?

Capacitance is important in many electronic circuits as it allows devices to store and release electrical energy. It is also used in filters, sensors, and other electronic components.

How is capacitance measured?

Capacitance is typically measured using specialized equipment such as a capacitance meter. It can also be calculated by measuring the charge and potential difference of a device and using the capacitance formula.

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