Filament bulb: Resistance increases with increase of the filament temperature. This is because ions in the metal filament vibrate more as the temperature increases so they resist the passage of the electrons through the filament more.
Diode: It allows current to only flow in one direction. In the forward direction the current is not directly proportional to the potential difference and the resistance is low. In the reverse direction, the current is much higher.
LDR: The resistance decreases if the light intensity on it increases.
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