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Heat And Power Developed In A Resistor MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET
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60 Questions around this concept.
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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:
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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.
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Download EBookAn 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
.
Concepts Covered - 1
Heat and power developed in a resistor
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Heat and Power developed in a resistor
Heat developed in a resistor: When a steady current flows through a resistance R for time t , the loss in electric potential energy appears as increased thermal energy(Heat H) of resistor and $H=i^2 R t$
The power developed $=\frac{\text { energy }}{\text { time }}=i^2 R=i R=\frac{V^2}{R}$
(from Ohm's law)
Unit of heat is the joule ( J )
Unit of power is watt (W)
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