Physics for IGCSE & O level - Electricity (Section 5 - No. 24)
In a circuit with a voltage source, a resistor, and a light bulb in series. If the resistance of the resistor increases, what happens to the brightness of the light bulb?
The bulb will get brighter.
The bulb will get dimmer.
The brightness is unchanged
The bulb will burn out immediately.
Giải thích
Increasing the resistance will decrease the current, leading to a dimmer bulb.