Tag: physics

Maximum power in a $0.5 \Omega$ resistance connected with two batteries of 2V emf  and $1 \Omega$ internal resistance in parallel is 

In which of the following the heating effect of an electric current is not used?

At a temperature T K,the pressure of 4.0 g argon in a bulb is p.The bulb is put in a bath having temperature higher by 50 K than the one.0.8 g of argon gas had to be removed to maintained ariginal pressure.The temperature T is equal to 

in electric bulb rated $160W,80\ V$ has to be operated across  $100\ V,50Hz$ a.c supply. The reactance Which is series with bulb should be-

Two electric bulbs have 60 W and 100 W rating at 220 V then ratio of their resistances will be 

A bulb rate $220 V, 100 W$ is connected across $110 V$ line. The power dissipated will be

A house hold $20$ liter geyser consist of a coil of resistance $R$, across which an $ac$ source of $rms$ voltage $V$ is connected. The wall thickness of geyser is $t(< < \sqrt{A})$ and the inner surface area of geyser is $A$. The average thermal conductivity of material of walls of geysers is $k$ and $S$ is specific heat capacity of water. Assuming initial temperature of water is equal to the temperature of atmosphere. The time taken to rise the temperature of water by $50^{o}C$ is (Neglect the specific heat of wall of geyser and radiation losses)

The voltage of domestic ac is $220\ V$. What does this represent?

If 2.2 kW power transmits 22000 V in a line of $10 \Omega$ resistance, the value of power loss will be :-

Mircrowave oven acts on the principle of