In the following circuit, $1 \,\Omega$ resistor dissipates power $P$. If the resistor is replaced by $9 \,\Omega$, the power dissipated in it is

210880-q

  • [KVPY 2011]
  • A

    $P$

  • B

    $3 P$

  • C

    $9 P$

  • D

    $\frac{P}{3}$

Similar Questions

The electric current passing through a metallic wire produces heat because of

A heating coil can heat the water of a vessel from $20\,^oC$ to $60\,^oC$ in $30$ minutes. Two such heating coils are put in series and then used to heat the same amount of water through the same temperature range. The time taken now will be ............ $min$ (neglecting thermal capacity of the coils)

A $220 \; V , 50 \; Hz$ AC source is connected to a $25 \; V$, $5 \; W$ lamp and an additional resistance $R$ in series (as shown in figure) to run the lamp at its peak brightness, then the value of $R$ (in ohm) will be

  • [JEE MAIN 2022]

If the length of the filament of a heater is reduced by $10\%$, the power of the heater will

A current i passes through a wire of length $l$, radius of cross-section $r$ and resistivity $\rho$. The rate of heat generation is