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 $\Omega$) is :

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

An electric bulb rated for is used in a circuit having supply. Find the resistance that must be put in series with the buck, so that the bulb draws .