Physics for IGCSE & O level - Electricity (Section 6 - No. 9)
Which of the following best describes how the brightness of a bulb is affected by the current passing through it?
Brightness increases with decreasing current.
Brightness decreases with increasing current.
Brightness increases with increasing current.
Brightness is not affected by current.
解释
The brightness of a bulb is directly proportional to the current flowing through it.