A bulb is rated 40 watt and the potential difference is 220v. Find the current drawn by it when it is connected to 220v supply.
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Thus, the current drawn by the bulb is 0.18A. Thus, the resistance of the 40 W bulb is 1210 ohm. Now, the given bulb is replaced by a bulb of rating 25 W; 220 V. ... Thus, the current drawn by the bulb is 0.113A.
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