Question
Download Solution PDFA 220 V, 100 W bulb is connected to a 110 V source. Calculate the power consumed by the bulb.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- Electric Power: The rate at which electrical energy is dissipated into other forms of energy is called electrical power i.e.,
\(P = \frac{W}{t} = VI = {I^2}R = \frac{{{V^2}}}{R}\)
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,
\(\Rightarrow R=\frac{V^2}{P}=\frac{(220)^2}{100}=484 \,\Omega\)
- The power consumed by the bulb.
\(\Rightarrow P=\frac{V^2}{R}=\frac{(110)^2}{484}=25 \,W\)
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