Week 2 Flashcards
Define resistor
A linear, two-terminal circuit element that passively dissipates power as heat
Define Ohm’s Law
States that the voltage difference across a resistor is proportional to the current flowing through the resistor. The constant of proportionality is the resistance
What is the equation for Ohm’s Law?
V = IR
Ohm’s Law only relates the voltage difference and current flow across ______ resistor
One
Resistance simply relates the _________ necessary to drive a specific _________
Voltage, current
What is the equation for power that includes resistance?
P = RI^2
Because resistors dissipate power as heat, they should always ___________ power from a circuit
Remove
What is the reciprocal of resistance?
Conductance
What is the symbol for conductance?
G
What is the unit for conductance?
Siemens (S) lmao
True or False: If you have multiple voltage sources and the power through one of them is positive, the voltage source is being recharged
True
What will happen if you put two current sources in a single-loop circuit?
One of them will break (violates KCL)
Define a voltage divider
Just two resistors in a single-loop circuit. Very useful when in larger circuits
True or False: In a voltage divider, the total voltage from the source is divided between each resistor in direct proportion to each resistance
True
Define a single node-pair circuit
A circuit with two loops
Define a current divider
Two resistors, each in a separate loop with the source (most easily demonstrated with a current source)
Define ‘in series’
When two (or more) circuit elements are connected such that the same current flows through them
Define ‘in parallel’
When two (or more) circuit elements are connected such that the same voltage is across them
Two (or more) voltage sources in series is equivalent to ____________
A single voltage source providing the algebraic sum of voltages
Two (or more) voltage sources in parallel __________________
Should be avoided unless all voltages are equal
Two (or more) current sources in parallel is equivalent to _________________
A single current source providing the algebraic sum of currents
Two (or more) current sources in series __________________
Should be avoided unless all currents are equal
Two (or more) resistors in series is equivalent to ___________________
A single resistor providing the sum of all resistances
Two (or more) resistors in parallel is equivalent to ___________________
A single resistor providing the reciprocal of the sum of all reciprocal resistances
The total resistance of resistors in _________ is always less than the resistance of any single resistance in this configuration
Parallel
True or False: We can freely expand or contract nodes in a circuit regardless of how ideal a wire in the circuit is
False
We can expand a single node of elements into two nodes of elements connected by a ______________
Short circuit
Define Y⇌∆ Transformation
A way to better analyze a circuit in which the resistors are neither in parallel or series. It converts a triangular-shaped circuit into a Y-shaped circuit (pronounced wye-delta transformation)
The most practical use of dependent sources is in part of a simplified model for a _______________________
Complex circuit element
If the control element is part of the circuit with the dependent source, then __________________________ must be solved
A system of equations
