BME - Electrical Engeneering at Medizinische Universität Wien

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Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

Characteristic of the EEG: amplitude range and frequency range?

Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

Example: An initially neutral body has 1.7 μC of negative charge removed. Later, 18.7 x 1011 electrons are added. What is the body’s final charge?

Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

Describe the action of a capacitor and define capacitance.


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Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

How is voltage defined? Most common voltage source? 

Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

What is the difference in conductors, insulators & semiconductors? 

Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

In electrical engineering - what is doping? 

Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

Definition of electric charge? 

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Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

Principle of superposition? 

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Which electrical field is shown by a capacitor? 

Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

Explain the concept of a magnetic dipole? 

Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

Which five elements are magnetic? 

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Law of Conservation of Charge? 

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Exemplary flashcards for BME - Electrical Engeneering at the Medizinische Universität Wien on StudySmarter:

BME - Electrical Engeneering

Characteristic of the EEG: amplitude range and frequency range?

  • amplitude: 0 to +- 1mV
  • bandwidth: < 50Hz
    1. alpha waves have the frequency spectrum of 8-13 Hz o beta waves= 13-30 Hz
    2. delta waves have the frequency range of 0.5- 4 Hz
    3. theta waves have the frequency range of 4-8 Hz

BME - Electrical Engeneering

Example: An initially neutral body has 1.7 μC of negative charge removed. Later, 18.7 x 1011 electrons are added. What is the body’s final charge?

1. Initial the body is neutral, i.e. 𝑄𝑏𝑜𝑑𝑦 = 0 𝐶.


2. When 1.7 μC of electrons is removed, the body is left with a + charge of 1.7 μC


3. Now, 18.7 x 1011 electrons are added back: 18.7∙1011 (𝑒𝑙𝑒𝑐𝑡𝑟𝑜𝑛𝑠) ∙ (−1.6021766208) × 10−19𝐶=−0.3𝜇𝐶 


4. The final charge of the body is therefore: 𝑄𝑏𝑜𝑑𝑦 =1.7𝜇𝐶+(−0.3𝜇𝐶)=1.4𝜇𝐶

BME - Electrical Engeneering

Describe the action of a capacitor and define capacitance.


A resistor does not generate electrical energy, nor does it store electrical energy for release later. A capacitor is a device used to store electric charge. 


Capacitors exhibit memory because they can store energy for later release, which allows the present output of a circuit containing these elements to depend upon previous inputs. In a capacitor, energy is stored in an electric field

BME - Electrical Engeneering

How is voltage defined? Most common voltage source? 

Voltage is always defined between points. Most common source: battery. 


Thus, voltage does not exist at a point by itself; it is always determined with respect to some other point. For this reason, voltage is also called potential difference.


Remember that voltage can exist without current

BME - Electrical Engeneering

What is the difference in conductors, insulators & semiconductors? 

  • Conductors: Free electron conduction in metals. The amount of energy required to escape depends on the number of electrons in the valence shell. If an atom has only a few valence electrons, only a small amount of additional energy is needed.


  • Insulators: Materials, such as glass/plastic/rubber, do not allow charges to move through them (e.g. pure water & dry table salt).


  • Semiconductors: e.g., silicon and germanium, are relatively good insulators as compared with metals, though not nearly as good as a true insulator like glass. The addition of the desired impurity to a semiconductor = doping. 

BME - Electrical Engeneering

In electrical engineering - what is doping? 

Doping increases the conductivity of a semiconductor so that it is more comparable to metal than an insulator.

BME - Electrical Engeneering

Definition of electric charge? 

Physical property of an object that causes it to be attracted toward or repelled from another charged object; each charged object generates and is influenced by a force called an electromagnetic force


BME - Electrical Engeneering

Principle of superposition? 

The electric fields, like gravitational fields, obey the principle of superposition (= 2 electrical field can be additive summed like vectors!). 


That is to say that if we know that a certain distribution of charge produces an electric field E1(r), and that some other distribution of charge produces a field E2(r), then when both charge distributions are present simultaneously the resultant electric field at any point r will be the vector sum:


Eres = E1(r) + E2(r).

BME - Electrical Engeneering

Which electrical field is shown by a capacitor? 

Cave: capacitor shows a homogeneous electrical field.

BME - Electrical Engeneering

Explain the concept of a magnetic dipole? 

The limitation arises from the fact that in practice it appears to be impossible to isolate either a north magnetic pole or a south magnetic pole. If, for instance, you cut a bar magnet in half, instead of obtaining two separate magnetic poles you will simply produce two small bar magnets, each with a north pole and a south pole = MAGNETIC DIPOLE.

BME - Electrical Engeneering

Which five elements are magnetic? 

iron (Fe), 

cobalt (Co), 

nickel (Ni), 

gadolinium (Gd) and 

dysprosium (Dy), and 

some associated alloys. 


These are known as ferromagnetic materials.

BME - Electrical Engeneering

Law of Conservation of Charge? 

The principle of conservation of charge states that the net charge of an isolated system remains constant during any physical process, e.g. two charge objects making contacting and separating.

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