I keep getting “Ohm's law” questions wrong in Current Electricity. What's the trap?
assuming every component is ohmic (a diode or bulb filament is not).
The usual trap: assuming every component is ohmic (a diode or bulb filament is not). How to avoid it: Ohm's law is a property of some materials, not a universal rule. Go back to the definition — for many conductors V = IR at constant temperature.
Key point
Ohm's law
Common mistake
assuming every component is ohmic (a diode or bulb filament is not).
Memory tip
Ohm's law is a property of some materials, not a universal rule.
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