Connect the light bulb load to the secondary coil. Adjust the variac to achieve

Question

Connect the light bulb load to the secondary coil. Adjust the variac to achieve 10VRMS on the primary coil. If the light bulb is rated at 60W, 24VRMS and can be assumed to be a purely resistive load, what is the resistance of the globe? RLamp = Knowing the secondary coil in the inductor has 200 turns, and the primary coil has 200 turns, predict the voltage that should appear on the secondary coil for 10VRMS on the primary. VRMS (Secondary Coil) = Using the lamp resistance, and the predicted output voltage of the secondary coil, what is the predicted current through the lamp? ILamp.RMS =

Explanation / Answer

(A) P = V2/R

R = 24*24/60 =9.6

( B) turns ratios are same so secondary and primary coil voltages will be same.

secondary voltage = 10 V rms

(c)

using ohm s law, current = V/R = 10/9.6 = 1.04 A

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