Power Questions

The total power dissipated in watts in the circuit shown here is:

A current of $3\text{A}$ flows through the $2\Omega$ resistor shown in the circuit. The power dissipated in the $5\Omega$ resistor is:

Power dissipated in an LCR series circuit connected to an a.c source of emf $ϵ$ is:

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of $2\text{ m/s}$. The mass per unit length of water in the pipe is $100\text{ kg/m}$. What is the power of the engine?

A source $S_1$ is producing $10^{15}\text{ photons per second}$ of wavelength $5000\text{ A˚}$. Another source $S_2$ is producing $1.02\times 10^{15}\text{ photons per second}$ of wavelength $5100\text{ A˚}$. Then (power of $S_2$)/(power of $S_1$) is equal to:

The power dissipated in the circuit shown (two $10\Omega$ resistors in parallel connected to $R$ in series, $10\text{V}$ battery) is $30\text{Watts}$. The value of $R$ is:

A car starts from rest and accelerates so that instantaneous power delivered is constant ($P_0$). The instantaneous velocity is proportional to:

$i=\sin (100\pi t)$ and $e=\sin (100\pi t+\pi /3)$. Average power in Watts is:

If voltage across a bulb rated $220\text{Volt}-100\text{Watt}$ drops by $2.5\%$ of its rated value, the percentage of the rated value by which the power would decrease is:

Two cities are $150\text{km}$ apart. Electric power is sent from one city to another city through copper wires. The fall of potential per $\text{km}$ is $8\text{volt}$ and the average resistance per $\text{km}$ is $0.5\Omega$. The power loss in the wire is: