Q1: What is a resistor?
A1: A resistor is a two-terminal element whose voltage across its terminals is proportional to the current through it. The proportionality constant is called resistance (R).
$v=iR$
Q2: What determines resistance?
A2: Resistance is determined by the composition and geometry of the resistor. Reaistance is influenced by temperature and strain. Some resistors may also react to light levels.
Q3: How do I simplify resistors in series?
A3: The equivalent resistor has a resistance equal to the sum of the individual resistances.
Q4: How do I simplify resistors in parallel?
A3: The equivalent resistor has a resistance equal to the inverse of the sum of the inverted individual resistances.
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