Question

A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

• A. 64 W
• B. 80 W
• C. 100 W
• D. 125 W

Answer 1

Answer: (A)

64 W

Answer 2

$P_{consumed} = \left( \frac{V_{A}}{V_{R}} \right)^{2} \times P_{R} = \frac{(160)^{2}}{(200)^{2}} \times 100 = 64W$