Subject Experts Solutions for Chapter: Current Electricity, Exercise 1: Practice Exercise

In the circuit shown in the figure, the currents $i_1$ and $i_2$ are passing through resistances $R_1$ and $R_2$ respectively, $V_1$ and $V_2$ are the respective voltage drops. If current $i$ is passing from $E$ to $F$ and the voltage drop across $EF$ is $V$, then these quantities are related as

Three bulbs with power rating of $40 \mathrm{W}, 60 \mathrm{W}$ and $100 \mathrm{W}$ at $220 \mathrm{V}$ are connected in series to a $220 \mathrm{V}$ mains. Energy consumption will be

Internal resistance of a $12 \mathrm{V}$ car battery is $0.02 \mathrm{\Omega }$. What is the theoretical maximum power which it can deliver?

For the network shown in figure, the resistance between points $A$ and $B$ will be,

How many calories of heat will approximately be developed in a $210 \mathrm{W}$ electric bulbs in $5 \min$ ?

A tap supplies water at $22°\mathrm{C}$. A man takes $1 \mathrm{litre}$ of water per $\min$ at $37°\mathrm{C}$ from the geyser. The power of geyser is

For a certain thermocouple, the emf $e=at+b{t}^2$ where $t$ in${}^{\circ }\mathrm{C}$ is the temperature of the hot junction. The cold junction being at $0°\mathrm{C}$. If $a=10 \mathrm{\mu V} {}^{\circ }\mathrm{C}^{-1}$ and $b=-0.02 \mathrm{\mu V} {}^{\circ }\mathrm{C}^{-1}$ then the temperature of inversion (in ${}^{\circ }\mathrm{C}$ ) will be:

A wire has a resistance of $32 \mathrm{\Omega }$. It is melted and drawn into a wire of half of its original length. What is the resistance of the new wire ?