I - V Relationships Flashcards
What is the basic relationship between current and potential difference
Ohm’s Law: For many conductors, current (I) is directly proportional to potential difference (V) if temperature is constant.
Formula: V = IR
What is the current-voltage relationship for metallic conductors at constant temperature?
Directly proportional – follows Ohm’s Law. The graph of V vs I is a straight line through the origin.
How does current relate to voltage in a filament lamp
As voltage increases, current increases but not proportionally. The resistance increases due to heating.
Graph shape: Curved, gradually flattening.
What is the current-voltage relationship in a semiconductor diode?
Current flows only in one direction after a certain threshold voltage.
Forward bias: Little current until ~0.6V, then rapid increase.
Reverse bias: Very small current (almost none).
Graph shape: Exponential curve after threshold in forward bias; flat in reverse.
What is the relationship between current and voltage in a copper sulphate solution with copper electrodes?
Current increases with voltage, showing electrolytic conduction. The solution conducts due to ions, not electrons.
Graph shape: Generally straight line, assuming constant ion concentration and temperature.
