$(a)$ State $Ohm's$ law. Express it mathematically.
$(b)$ Write symbols used in electric circuits to represent
$(i)$ variable resistance.
$(ii)$ voltmeter.
$(c)$ An electric bulb is rated $220, V$ and $100\, W$ When it is operated on $110\, V ,$ what will be the power consumed ?
$(a)$ State $Ohm's$ law. Express it mathematically.
$(b)$ Write symbols used in electric circuits to represent
$(i)$ variable resistance.
$(ii)$ voltmeter.
$(c)$ An electric bulb is rated $220, V$ and $100\, W$ When it is operated on $110\, V ,$ what will be the power consumed ?
$(a)$ See Chapter at a Glance.
$(b)$ $\quad$ $(i)$ Variable resistance
$(c)$ Given $P=100\, W, V=220 \,V$
$V _{1}=110 V$
The resistance of the bulb is given by
$R =\frac{ V ^{2}}{ P }=\frac{(220)^{2}}{100}=484 \Omega$
Now, power at $110\, V$ is
$P=\frac{V^{2}}{R}=\frac{(110)^{2}}{484}=25 W$
Similar Questions
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$(d)$ Power dissipated in $4\,\Omega $ resistor
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$(e)$ Difference in ammeter readings, if any.
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