Heat And Power Developed In A Resistor MCQ - Practice Questions with Answers

The resistive network shown below is connected to a D.C. source of 16 V. The power consumed by the network is 4 watts. The value of R (in $\mathrm{\Omega }$) is :

In the circuit shown, the resistance r is a variable resistance. If for $r=fR$, the heat generation in r is maximum then the value of $f$ is:

Two resistors of resistance, $100\mathrm{\Omega }$ and $200\mathrm{\Omega }$ are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in $100\mathrm{\Omega }$ to that in $200\mathrm{\Omega }$ in a given time is:

If the voltage across a bulb rated 220 volt - 100-watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is:

A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R

The charge flowing through a resistance R varies with time t as Q = at - bt², where a and b are positive constants. The total heat produced in R is:

Two electric bulbs have tungsten filaments of the same length. If one of them gives and the other , then

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

A line having a total resistance of delivers at to a small factory. The efficiency of transmission is near -

A capacitor of capacitance has . It's connected to an identical capacitor through a resistance. Find heat produced in the resistance.