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Q16 (NDA-II/2022) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism

An electric bulb is connected to 220 V generator. The current drawn is 600 mA. What is the power of the bulb?

Result
Your answer: —  Â·  Correct: A
Explanation

To find the power of the electric bulb, we use the standard electrical power formula: Power (P) = Voltage (V) × Current (I). According to the provided data, the bulb is connected to a 220 V generator, and the current drawn is 600 mA. First, the current must be converted from milliamperes to the standard unit of Amperes (A). Since 1000 mA equals 1 A, 600 mA is equivalent to 0.6 A. Applying the formula, P = 220 V × 0.6 A, which results in 132 Watts (W). This calculation aligns with the definition that one watt of power is consumed when 1 A of current flows at a potential difference of 1 V [3]. Similar problems in educational texts demonstrate that power is the product of potential difference and current [1]. Therefore, the power of the bulb is 132 W.

Sources

  1. [3] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > EXERCISES > p. 194
  2. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > What you have learnt > p. 192
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