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PHYS1252 Exam 3
| Question | Answer |
|---|---|
| As an electron travels through an ohmic resistor, how does the PE change? | Decreases |
| Suppose a simple parallel-plate capacitor plates are now pulled apart until they are separated by a distance D > d, while the charge remains constant. The electric potential energy stored in the capacitor | Increases |
| Anode | Build-up of electrons |
| Cathode | Dearth of electrons |
| Capacitor | Two conductive plates separated by empty space or an insulator. Electric potential difference even though net charge is zero (Equal and opposite charges) |
| Battery | Source of potential difference between the positive and negative leads of the battery |
| Difference between capacitor and battery | Battery: stores energy in chemicals Capacitor: stores energy in an electric field |
| How does a battery release energy | Provides a steady flow of charge (voltage stays almost constant for a while) |
| How does a capacitor release energy | Provides a quick burst of charge (voltage drops rapidly as it discharges) |
| What are capacitors used for | Fast power delivery - camera flashes or stabilizing circuits |
| Electric Current | Amount of positive charge passing through a cross-sectional area per unit time |
| Ohm's Law Microscopic | J=oE (greek letter sigma) |
| What does the greek letter sigma mean? | Electrical conductivity - how easily a material lets electric charge flow through it |
| What does resistance depend on? | Geometry of the component and the properties of the material R=p(L/A) |
| How do resistivity and temperature correlate? | The resistivity of materials goes up as the temperature goes up (semiconductors usually follow the opposite pattern) |
| Semiconductor | Behaves like a conductor and an insulator |
| What happens to the amount of voltage lost to internal resistance if R is bigger | The voltage would decrease because the internal resistance r would have a smaller effect on the overall circuit - greater percentage of the battery's emf should show up as the voltage difference across the load |
| micro | 10 to the negative 6 |
| mili | 10 to the negative 3 |
| kilo | 10 to the 3 |
| What creates an electric field | Stationary electric charges like protons or electrons |
| What creates a magnetic field | Moving charges or changing electric fields |
| A bar magnet is in the shape of a long cylinder, with the poles at opposite ends of the cylinder. The magnetic field lines inside the magnet | Run from the south pole to the north pole |
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