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What is the effect of increased temperature on the resistance of most conductors?
Increased temperature typically leads to increased resistance in conductors.
What happens when electrical energy is applied to a resistor?
The resistor converts electrical energy into thermal energy, heating up the resistor and its surroundings.
What is the effect of doubling the length of a wire on its resistance, assuming other factors remain constant?
Doubling the length of a wire doubles its resistance.
What is the effect of doubling the radius of a wire on its resistance, assuming other factors remain constant?
Doubling the radius of a wire reduces its resistance by a factor of four.
What is Ohm's Law?
Ohm's Law describes the relationship between voltage ($V$), current ($I$), and resistance ($R$) in a circuit: $V = IR$
Define Voltage ($V$).
The electrical potential difference across a component, measured in volts (V).
Define Current ($I$).
The flow of electric charge, measured in amperes (A).
Define Resistance ($R$).
The opposition to the flow of current, measured in ohms (Ω).
What is Resistivity ($
ho$)?
A material's intrinsic property that measures how strongly it opposes the flow of electric current. It's measured in ohm-meters (Ω⋅m).
Define Resistance ($R$).
The measure of how much a material opposes the flow of electric current. It depends on the material's resistivity ($
ho$), length ($L$), and cross-sectional area ($A$): $R = \frac{\rho L}{A}$
What are the key differences between Resistance and Resistivity?
Resistance: Depends on the size and shape of the material. | Resistivity: An inherent property of the material.
What is the difference between ohmic and non-ohmic materials regarding resistance?
Ohmic Materials: Have constant resistance regardless of current. | Non-Ohmic Materials: Resistance changes with current.