Some examples from this set of practice questions
1.
Explain Ohm\'s law. Under what conditions does it not hold true?
Answer: Ohm\'s law states that the current flowing through a conductor (I) is linearly proportional to the voltage across it (V), i.e., V=IR. It does not hold true for all conductors, especially non-Ohmic conductors like semiconductors.
2.
Define power and provide the formula to calculate it in terms of current and voltage. How is it related to energy dissipated in a circuit?
Answer: Power is the rate at which electrical work is expended and is calculated using the formula P=IV. It is related to energy dissipated as E= ∫P dt.
3.
What is a potential divider used for, and what is the formula for calculating the output voltage?
Answer: A potential divider is used to obtain a specific fraction of the input voltage. The formula for calculating the output voltage (V_out) is V_out = (R2 / (R1 + R2)) * V_in, based on Ohm\'s law and the concept of voltage division.
4.
Explain the concepts of nodes, branches, loops, and their significance in circuit analysis.
Answer: A node is a connection between 2 or more components, a branch is a single pathway with 2 ends, and a loop is a pathway that comprises a complete circuit. They are significant in circuit analysis as they help in understanding the flow of current and voltage in a circuit.
5.
What factors determine the resistance of an ohmic conductor?
Answer: The resistance of an ohmic conductor is determined by the resistivity of the material and the geometry of the conductor. Resistivity (ρ) is a material property and is a measure of how many electrons are available, and how easy it is to move electrons.
6.
What is charge and how do electrons (holes) react to an electrical potential difference?
Answer: Charge is the fundamental quantity to which electrons (or holes) react by flowing in response to an electrical potential difference (voltage).
7.
What are the characteristics of parallel circuit connections?
Answer: Components in parallel circuits share a common voltage
8.
What is the definition of voltage and how does it affect the movement of charge in a circuit?
Answer: Voltage is the potential energy that pushes charge around a circuit. It provides 1 joule of energy to each passing coulomb of charge. Voltage affects the movement of charge by creating a potential difference that drives the flow of charge in a circuit.
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