Home
Class 10
PHYSICS
State Joule's law of heating and give it...

State Joule's law of heating and give its mathematical form. An electric iron takes a current of 5A and develops `1.5 xx 10^(4) J` of heat energy in 30 s. Calculate the resistance of the electric iron.

Text Solution

AI Generated Solution

**Step-by-Step Solution:** 1. **State Joule's Law of Heating:** Joule's law of heating states that when an electric current passes through a conductor, heat is produced in the conductor. The amount of heat produced is directly proportional to the square of the current, the resistance of the conductor, and the time for which the current flows. 2. **Mathematical Form of Joule's Law:** The mathematical expression for Joule's law is given by: \[ ...
Promotional Banner

Similar Questions

Explore conceptually related problems

(a) A current of 1 A flows in a series curcuit containing an electric lamp and a conductor of 5 Omega when connected to a 10 V battery. Calculate the resistance of the electric lamp. (b) Now if a resistance of 10 Omega is connected in parallel with this series combination, what change (if any) in current flowing through 5 Omega conductor and potential difference across the lamp will take place ? Give reason.

An electric iron of resistance 20 Omega takes a current of 5 A . Calculate the heat developed in 30 s .

An electric heater of resistance 8 Omega draws 15 A from the service mains for 2 hours. Calculate the rate at which heat is developed in the heater.

A particle having a charge + 3 xx 10^(-9 )C is placed in a uniform electric field directed toward left. It is released from rest and moves a distance of 5 cm after which its kinetic energy is found to be 4.5 xx 10^(-5) J . (a) Calcnalate the work done by the electrical force on the particle (b) Calculate the magnitude of the electric field. (c) Calculate the potential of starting point with respect to the end point of particle's motion.

If a steam engine delivers 6.0xx10^(8)J of work per minute and absorbs 5.4xx10^(9)J of heat per minute from its boiler then the efficiency of the engine is

An electrtic dipole with dipole moment 4xx10^(-9) C m is aligned at 30^(@) with the direction of a uniform electric field of magnitude 5xx10^(4) NC^(-1) . Calculate the magnitude of the torque acting on the dipole .

An electric dipole is formed by + 4 mu C and - 4 mu C charges at 5 m m distance. Calculate the dipole moment and give its direction.

Find the total heat produced in the loop of the previous problem during the interval 0 to 30 s if the resistance of the loop is 4.5 mOmega.

In an electromagnetic wave, the amplitude of electric field is 1 V//m . The frequency of wave is 5xx10^(14)Hz . The wave is propagating along z -axis. The average energy density of electric field, in "joule"//m^(3) ,will be