1 Summary Use the work-energy relations to understand/ estimate 1)the work done by thrust force for cruising or acceleration; 2) Estimate fuel economy.

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Presentation transcript:

1 Summary Use the work-energy relations to understand/ estimate 1)the work done by thrust force for cruising or acceleration; 2) Estimate fuel economy of a car /air plane; 3) Understand the advantage of flying high.

Introduction to electricity and electric circuits electric charges, conductors and insulators

Example: He-Atom 2 protons, positively charged: + 2e 2 neutrons, no charge 2 electrons, negative charge: - 2e elementary charge, e = 1.6 x C Atoms are neutral, unless electrons are removed (or added): Ionization requires energy. Protons and neutrons consists of 3 quarks each.

Properties of Electric Charge Charges are due to elementary particles: Protons carry (+ e), electrons carry (- e). Charge is quantized: Q = n · e with n = ± 1, ± 2, ± 3, … and e = x C Charge is conserved. Atoms are neutral in their ‘normal’ state. All objects are uncharged (electrically neutral) in their normal state. Charged objects exert a force onto each other: like charges repel each other, unlike charges attract each other.

Solid Conductors (Metals) Transport electric charges well. Freely moving conduction electrons and bound electrons that remain at the location of the nucleus of each atom. Atoms (nucleus + bound electrons) remain in place and form a crystal lattice (chemical bonds). Positive charges (ions) can only move in a liquid or a gas. Electric current: Net motion of charges (free electrons in a metal).

Demos Pie plates on Van De Graaff generator.

Insulators Insulators (plastic, glass, pure water): All electrons are tightly bound and cannot move. No conduction electrons (or only very few): no transport of charge, i.e. electric currents. You can charge an insulator: Rubbing a glass rod with a silk cloth. The rubbing action removes electrons locally from the glass surface. The positive charge remains there because other electrons cannot move there to replace the missing electrons.

Conductors and Insulators Excess charge on a conductor is distributed so that the net electrostatic force on each charge is zero (electrostatic equilibrium). Only surface charges. Excess charge on an insulator remains at the spot where it was deposited. The same element or material may be conducting or insulating, depending on its crystal structure. Carbon is an example for this: at room temperature, graphite is a good conductor while diamond is an insulator.

Grounding Connecting a charged conductor to Earth: Extra charges are neutralized by Earth. Earth = infinite sink (or supply) of charges. In practice, connection to your water lines or heat pipes makes a good ground connection, as long as these pipes are made of metal. Your wall plugs also provide an Earth-ground lead (the small circular plug).

Electric Circuits Power source maintaining a potential difference. Consumer (load resistance). Conducting wire to connect the potential difference and form a circuit. Only when the circuit is closed, power source drives electrons around the circuit (electric current). The potential energy stored inside the battery is transformed into kinetic energy of the electrons. + - VV R1R1 R2R2 I

The Electric Battery Contains a large amount of electric potential energy due to the separation of positive and negative charges. Acts as the source and the drain for the electrons in the circuit (‘charge pump’). Once an electron arrives at the positive terminal, another electron is produced at the negative terminal: An electrochemical reaction maintains a constant potential difference (‘voltage’ or emf  ) until the battery is dead. R1R1 + -

Electric Potential Energy Electric potential energy stored inside a battery due to the separation of many charges: Charging the battery. Assume that the battery has already more positive charges in one chamber, and more negative charges in the other. Must do work to move another electron from the positive side to the negative side against the Coulomb force. The net work to separate positive and negative charges is stored as electric potential energy