Q23 of 72 Page 12

An electric bulb is rated at 220V, 200W. What is its resistance?

Power, P = ⇒ 200 = ⇒ R = = 242 ohms.

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21 What is resistance? How is resistance caused. What are the factors it depends? How does it vary with temperature? 22 Define electric Power. What is its unit? 24 A torch bulb is rated at 2.5V, 500 A. Find the power and resistance. 25 What is the S.I. unit of Power?