What happens to the current in an incandescent lamp when it is dimmed electronically?

When an incandescent lamp is dimmed electronically, it usually involves the use of a device called a dimmer switch, which alters the voltage supplied to the lamp. As a result, the current flowing through the filament decreases because the power and brightness of the incandescent lamp are directly related to the voltage applied.

Dimming reduces the voltage, which leads to a decline in current flow through the lamp. This reduction in current results in a decrease in the brightness of the light emitted. The filament itself does not typically vibrate or cause a hum under normal dimming conditions; any noise might occur due to the dimmer circuit design but is not a primary effect of dimming the bulb itself.

Therefore, the most accurate observation regarding what happens to the current in an incandescent lamp when electronically dimmed is that the current rate declines, which reflects the direct relationship between voltage and current in the operation of incandescent bulbs.