A 200.v lamp ha a resistance of 400 ohms. The power rating in watts of lamp is ______.
A. 100w
B. 600w
C. 200w
D. 250w
Answer:A
A 200.v lamp ha a resistance of 400 ohms. The power rating in watts of lamp is ______.
A. 100w B. 600w C. 200w D. 250w