Question

Q.9 Single Choice
An electric bulb is rated (40 W, 200 V). If it is operated
at 120 V, then power consumed by it, is
एक विद्युत बल्ब पर (40W, 200V) अंकित है। यदि यह 120 V पर
कार्य करता है, तब इसके द्वारा व्ययित शक्ति है​

Answer 1

Answer:

The power is 10 watt. Hence, The power is 10 watt

Answer 2

Given : An electric bulb is rated (40 W, 200 V).

To Find : it is operated at 120 V, then power consumed by it

Solution:

P = V²/R

=> R = V²/P

=> R = 200²/40

operated at 120 V

=> P =(120)²/R

=> P =(120)²/(200²/40)

=> P = 40 * (120/200)²

=> P = 14.4 W

power consumed by it, = 14.4 W

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