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level: Level 1 of Chapter 10

Questions and Answers List

level questions: Level 1 of Chapter 10

QuestionAnswer
When does a conductor obey Ohm's lawif the current in it is directly proportional to the potential difference across its ends
When a conductor does not obey Ohm's law it is decribed as....non-ohmic
What are Thermistors?Components designed to have a resistance that changes rapidly with temperature
Thermistors are made from?Metal oxides such as those of manganese and nickle
What are the 2 different types of resistors and how does it work (4)Negative temperature coefficient (NTC thermistors) - resistance of this type of thermistor decreases with increasing temperature Positive temperature coefficient (PTC) thermistors-the resistance of this type of thermistor rises abruptly at a definite temperature, usually around 100-150 ℃
What is a diode?any component that allows electric current in only one direction
What are modern diodes made from and how do they workModern diodes are made from silicon and will start conducting when there is a potential difference of about 0.6V across them
What does the resistance of a diode depend on?on the potential difference across it
How does a light-dependent resistor workIf light falling on the LDR is of a high enogh frequency, photons are absorbed by the semiconductor. As some photons are absorbed, electrons are released form atoms in the semiconductor. The resulting free electrons conduct electricity and the resistance of the semiconductor is reduced
What are the 2 factors that affect the resistance of a metal:1. Temperature 2. The presence of impurities
For a metal in the shape of a wire, R depends on the following factors (4)1. Length L 2. Cross section area A 3. The material the wire is made from 4. Temperature of a wire
What is the formula we use to calculate resistance(resistivity ✖️ length ) ➗ cross-sectional area
What is the formula we use to calculate resistivity(resistance ✖️ cross-sectional area) ➗ Length