P2 : Resistors Flashcards
1
Q
Potential difference and current in a resistor
A
In a a resistor, potential difference is directly proportional to current provided temperature is constant as it follows Ohm’s law
2
Q
Filament bulb
A
A filament bulb does not follow ohm’s law (non-ohmic). As voltage and current increase, the temperature of the filament increases and so does resistance
3
Q
LED
A
An LED is non - ohmic and only allows current to flow in one direction. The LED will only work if the current flows in the right direction
