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level: Current-voltage characteristics

Questions and Answers List

level questions: Current-voltage characteristics

QuestionAnswer
What is the symbol for an ohmic conductorohmic conductor
What is the symbol for a semiconductor diodesemiconductor
What is the symbol for a fileament lampcircle with cross
Why when the resistance is fixed is current and pd across a component directly proportionalBecause V=IR So if R doesnt change and the current does then the voltage must also, and visa versa
If the resistance is fixed along a wire, what is the relationship between the current and the pd across it if the pd was to changeDirectly proportional to one another
How would you define an ohmic conductorA resistor that follows ohms law
What is ohms law?V=IR
What is a semiconductor diodeA diode (lamp) that only allows the flow of electricity in one direction
Whats the current voltage characteristic for a filament lamps
Whats the current voltage characteristic for a ohmic conductors
Whats the current voltage characteristic for a semiconductor diodeFine to exclude the negative current
Why does an ohmic conductor have the shaped graph it has?WRONG: //Because when current is increased the frequency of collisions with electrons with the ions in the lattice increases This make the ions vibrate more, increasing temperature Increase in temperature makes collisions even more likely, increasing resistance// RIGHT: Because ohms law V = IR This rearanges to V/I = R (which is a constant) So V/I is directly proportional
Explain why diode only allows charge to flow in one directionCause it has a very high resistance one way and a very low resistance the other way
Explain why for a semiconducting diode after a lot of negative pd does current all of a sudden shoot downDiodes broken down, so the current becomes infinite, and a short circuit.
Explain why a filement lamp has the IV characteristics it doesAs the potential difference across a filament lamp increases, the current increases and the energy dissipated, as heat, increases, resulting in a higher temperature. As the temperature increases, resistance of the filament increases. The collision between the free electrons and the lattice ions increases due to more rigorous vibration of the lattice ions