20 A typical light dimmer used to dim the stage lights in a

Last updated: 6/11/2023

20 A typical light dimmer used to dim the stage lights in a theatre consists of a variable induction for L where inductance is adjustable between zero and Imax connected in series with a light bulb B as shown The mains electrical supply is 220 V at 50 Hz the light bulb is rated at 220 V 1100 W What Lmax is required if the rate of energy dissipation in the light bulb is to be varied by a factor of 5 from its upper limit of 1100 W 1 0 69 H 3 0 38 H Imp to mains 2 0 28 H 4 0 56 H Bulb