An electric kettle takes $4\, A$ current at $220\,V.$ How much time will it take to boil $1\,\, kg$ of water circuits are consequences of from temperature $20\,^o C\, ?$ The temperature of $(a)$ conservation of energy and electric charge boiling water is $100\,^o C.$ ............... $min$
AIPMT 2008, Medium
Download our app for free and get started
$\text { Power }=220\, \mathrm{V} \times 4\, \mathrm{A}=880\, \text { watts. }=880\, \mathrm{J} / \mathrm{s}$
Heat needed to raise the temperature of $1\,kg$ water through $80\,^{o} \mathrm{C}$
$ = ms.\,\Delta T \times 4.2\,{\rm{J}}/{\rm{cal}}$
$ = 1000\,{\rm{g}} \times 1\,{\rm{cal}}/{\rm{g}} \times 80 \times 4.2\,{\rm{J}}/{\rm{cal}}$
$ \therefore $ Time taken ${=\frac{1000 \times 1 \times 80 \times 4.2}{880}=\frac{336 \times 10^{3}}{880}} $
${=382\, \mathrm{s}=6.3\, \mathrm{min}}$
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1$\mathrm{A}$ circuit is comprised of eight identical batteries and a resistor $R = 0.8\,\Omega$ . Each battery has an $\mathrm{emf}$ of $1.0\, V$ and internal resistance of $0.2\,\Omega$ . The voltage difference across any of the battery is ............. $V$View Solution
- 2An ammeter with internal resistance $90\,\Omega $ reads $1.85\, A$ when connected in a circuit containing a battery and two resistors $700\,\Omega $ and $410\,\Omega $ in series. Actual current will beView Solution
- 3$A$ current passes through a wire of nonuniform cross section. Which of the following quantities are independent of the cross-section?View Solution
- 4A hollow cylindrical conductor has length of $3.14\,m$, while its inner and outer diameters are $4\,mm$ and $8\,mm$ respectively. The resistance of the conductor is $n \times 10^{-3}\,\Omega$.If the resistivity of the material is $2.4 \times 10^{-8}\,\Omega\,m$. The value of $n$ is $..........$View Solution
- 5What will be equivalent resistance of circuit between $x$ and $y$View Solution
- 6In a meter bridge experiment, resistances are connected as shown in the following figure. The balancing length $l_1$ is $55\, cm$. Now, an unknown resistance $x$ is connected in series with $P$ and the new balancing length is found to be $75\, cm$. The value of $x$ isView Solution
- 7If power in $3\,\Omega $ is $27\,W$ then what is the power in $2\,\Omega $ ................ $\mathrm{W}$View Solution
- 8A current of $2\, mA$ was passed through an unknown resistor which dissipated a power of $4.4\, W$. Dissipated power when an ideal power supply of $11\, V$ is connected across it isView Solution
- 9In the circuit shown in the figure $K_1$ is open. The charge on capacitor $C$ in steady state is $q_1$. Now key is closed and at steady state charge on $C$ is $q_2$. The ratio of charges $q_1/q_2$ isView Solution
- 10The voltage $V$ and current $I$ graph for a conductor at two different temperatures ${T_1}$ and ${T_2}$ are shown in the figure. The relation between ${T_1}$ and ${T_2}$ isView Solution
