MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Power Delivered and Heat Dissipated in a Circuit

Which of the ...

Question

Which of the following plots may represent the thermal energy produced in a resistor in a given time as a function of the electric current?

Open in App

Solution

Plot (a) is the correct option.

When current passes through a resistor, the heat produced,
H = I²Rt,
where I = current
R = resistance of the resistor
t = time for which current is flowing
This relation shows that the heat produced for a given time in a resistor varies with the square of current flowing through it. Hence, the plot between H vs I should be a parabola symmetric along the H axis, which is represented by curve a.

Suggest Corrections

thumbs-up

0

Similar questions

Q. Two resistors of equal resistances are joined in series and a current is passed through the combination. Neglect any variation in resistance as the temperature changes. In a given time interval,
(a) equal amounts of thermal energy must be produced in the resistors
(b) unequal amounts of thermal energy may be produced
(c) the temperature must rise equally in the resistors
(d) the temperature may rise equally in the resistors

Q. A hot liquid is kept in a big room. Its temperature is plotted as a function of time. Which of the following curves may represent the plot?

Q. A constant current i is passed through a resistor. Taking the temperature coefficient of resistance into account, indicate which of the plots shown in the figure best represents the rate of production of thermal energy in the resistor.

Q. A current i₁ = i₀ sin ωt passes through a resistor of resistance R. How much thermal energy is produced in one time period? A current i₂ = −i₀ sin ωt passes through the resistor. How much thermal energy is produced in one time period? If i₁ and i₂ both pass through the resistor simultaneously, how much thermal energy is produced? Is the principle of superposition obeyed in this case?

Q. Which of the following curves may represent the energy of an electron in a hydrogen atom as a function of principal quantum number

n

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Power Delivered and Heat Dissipated in a Circuit

PHYSICS

Watch in App

explore_more_icon

Explore more

Power Delivered and Heat Dissipated in a Circuit

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon