An electric bulb is rated '220 V, 100 W'. (a) What is it's resistance? (b) What safe current can be passed through it?
Current Electricity
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Question

An electric bulb is rated '220 V, 100 W'. (a) What is it's resistance? (b) What safe current can be passed through it?

KnowledgeBoat · Accepted Answer

(a) Given, P = 100 W V = 220 volt We know that, Power P = Substituting the values in the formula above, we get, Hence, resistance of electric bulb = 484 Ω (b) From relation P = VI Safe current I = Substituting the value we get, Hence, safe current limit = = 0.45 A

Physics

An electric bulb is rated '220 V, 100 W'. (a) What is it's resistance? (b) What safe current can be passed through it?

Current Electricity

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