A ($100\, W$, $200\, V$) bulb is connected to a $160\, V$ power supply. The power consumption would be ............. $W$
AIPMT 1997, Medium
Download our app for free and get started
(a) ${P_{consumed}} = {\left( {\frac{{{V_A}}}{{{V_R}}}} \right)^2} \times {P_R} = \frac{{{{(160)}^2}}}{{{{(200)}^2}}} \times 100$$ = 64\,\,W$
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
- 1An ideal battery of $4\, V$ and resistance $R$ are connected in series in the primary circuit of a potentiometer of length $1\, m$ and resistance $5\,\Omega $ . The value of $R$, to give a difference of $5\, mV$ across $10\, cm$ of potentiometer wire, is: ................ $\Omega$View Solution
- 2$A$ current passes through a wire of nonuniform cross section. Which of the following quantities are independent of the cross-section?View Solution
- 3In the given circuit the cells have zero internal resistance. The currents (in Amperes) passing through resistance $R_1$ and $R_2$ respectively, areView Solution
- 4Some electric bulbs are connected in series across a $220\, V$ supply in a room. If one bulb is fused then remaining bulbs are connected again in series across the same supply. The illumination in the room willView Solution
- 5An electric wire is connected across a cell of $e.m.f.$ The current $I$ is measured by an ammeter of resistance $R$. According to ohm's lawView Solution
- 6Figure shows a thick shell made of electrical conductivity $\sigma$ and has inner & outer radii of $10\ cm$ & $20\ cm$ respectively and is filled with ice inside it. Its inside and outside surface are kept at different potentials by a battery of internal resistance $\frac{2}{\pi} \Omega \ \&\ \in = 5V$. Find value of $\sigma$ for which ice melts at maximum possible rate if $25\%$ of heat generated by shell due to joule heating is used to melt ice.View Solution
- 7If a $0.1\%$ increase in length due to stretching, the percentage increase in its resistance will be ............ $\%$View Solution
- 8A piece of copper and another of germanium are cooled from room temperature to $80\, K$. The resistance of :-View Solution
- 9The figure shows a network of currents. The magnitude of currents is shown here. The current $i$ will be ................. $A$View Solution
- 10Column $- I$ gives certain physical terms associated with flow of current through a metallic conductor. Column $- II$ gives some mathematical relations involving electrical quantities. Match Column $- I$ and Column $- II$ with appropriate relations.View Solution
Column $- I$ Column $- II$ $(A)$ Drift Velocity $(P)$ $\frac{m}{n e^{2} \rho}$ $(B)$ Electrical Resistivity $(Q)$ $\mathrm{ne} v_{\mathrm{d}}$ $(C)$ Relaxation Period $(R)$ $\frac{\mathrm{eE}}{\mathrm{m}} \tau$ $(D)$ Current Density $(S)$ $\frac{E}{J}$