Ohmic Conductors & I-V Characteristics | GCSE Physics
Learn how to interpret Current-Voltage (I-V) graphs for different electrical components.
What does a straight line through the origin on an I-V graph tell you?
What is Ohmic Conductors & I-V Characteristics | GCSE Physics?
"A conductor that obeys Ohm's law, where current is directly proportional to potential difference."
What is the unit of electrical resistance?
Misconception: When a circuit is closed, the 'spent' current returns to the battery.
Calculate the charge flow if a 3A current flows for 10 seconds.
Current is the rate of flow of ____.
Ohmic Rules
Ohmic conductors: Current is directly proportional to PD (straight line).
Filament lamp: Resistance increases as temperature rises (S-shaped curve).
Diode: Only allows current to flow in one direction.
Steeper gradient on an I-V graph usually indicates lower resistance.
Graph Skill: Be careful! If the graph is V against I, the gradient represents resistance. If it is I against V, the gradient is 1/resistance.
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