State which has a higher resistance a $50\, W$ or a $25\, W$ lamp bulb and how many times ?
State which has a higher resistance a $50\, W$ or a $25\, W$ lamp bulb and how many times ?
We know that $R =\frac{ V ^{2}}{ P }$ or $R \propto \frac{1}{ P }$. Thus, a $25 W$
lamp has double the resistance of a $50 \,W$ lamp.
Similar Questions
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of $2\,\Omega $ in series with a combination of two resistors ($4\,\Omega $ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the $2\,\Omega $ resistor be the same as that across the parallel combination of $4\,\Omega $ resistors? Give reason.
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$(a)$ How much current will an electric bulb draw from a $220\, V$ source, if the resistance of the bulb filament is $1200\,ohm$ ?
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$(a)$ How much current will an electric bulb draw from a $220\, V$ source, if the resistance of the bulb filament is $1200\,ohm$ ?
$(b)$ How much current will an electric heater coil draw from a $220\, V$ source, if the resistance of the heater coil is $100\, ohm$ ?