EM.9(1) – Electric Light Dimmer – RL in Series
A light bulb (a flood light) is connected in series with an inductor and an AC power source. The inductor consists of a large coil with a long sliding iron core. The light bulb is bright when the iron core is out of the coil. The light gets dimmer as the core is pushed inside the coil.
![Electric Light Dimmer - RL in Series](https://dornsife.usc.edu/lecture-support-lab/wp-content/uploads/sites/280/2023/08/em10_1.jpg)
EM.9(2) – LRC in Series
A flood light R, a capacitance C and an inductance L are connected in series to an AC power source. In this circuit, the current depends not only on R but also on the reactance X = XL – XC. The inductance L has a long sliding iron core which allows one to vary L. When XL is equal to XC, the circuit draws the maximum current, giving the brightest light to the bulb.
![LRC in Series](https://dornsife.usc.edu/lecture-support-lab/wp-content/uploads/sites/280/2023/08/em10_2.jpg)