A 220 V, 100 W bulb is connected to a 110 V source. Calculate the power consumed by the bulb.

  1. 10 W
  2. 15 W
  3. 20 W
  4. 25 W

Answer (Detailed Solution Below)

Option 4 : 25 W
Free
RRB Group D Full Test 1
100 Qs. 100 Marks 90 Mins

Detailed Solution

Download Solution PDF

CONCEPT:

  • Electric Power: The rate at which electrical energy is dissipated into other forms of energy is called electrical power i.e.,

Where V = Potential difference, R = Resistance and I = current.

CALCULATION:

Given - Potential difference (V) = 220 V, power of the bulb (P) = 100 W and actual voltage (V') = 110 V

  • The resistance of the bulb can be calculated as,

  • The power consumed by the bulb.

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