(a) How much current will an electric bulb draw from a 220 V source, if the resistance of the bulb filament is 1200 Ω? (b) How much current will an electric heater coil draw from a 220 V source, if the resistance of the heater coil is 100 Ω?

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  1. Class 10
  2. Chapter 12 Class 10 - Electricity

Transcript

Example 12.3 (a) How much current will an electric bulb draw from a 220 V source, if the resistance of the bulb filament is 1200 Ω? (b) How much current will an electric heater coil draw from a 220 V source, if the resistance of the heater coil is 100 Ω? Potential difference = V = 220 V By ohm’s law, V = I R ∴ 𝑉/𝑅 = I I = 𝑉/𝑅 R = 1200 Ω I = 𝑉/𝑅 I = 220/1200 I = 22/120 I = 11/60 I = 0.18 A R = 100 Ω I = 𝑉/𝑅 I = 220/100 I = 22/10 I = 2.2 A Current through bulb filament of 1200 Ω is 0.18 A Current through bulb filament of 100 Ω is 2.2 A

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.