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

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

An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Consider the reaction, 2N_2O_5 rarr 4NO_2 + O_2 The concentration of N_2O_5 decreases from 2.33M to 2.08M in 184 minutes. Calculate the average rate in terms of hours, minutes and seconds. What is the rate of production of NO_2 during the period.

An electric heater supplies heat to a system at a rate of 100W. If system performs work at a rate of 75 Joules per second. At what rate is the internal energy increasing

An electric heater takes 15 min to raise a certain quantity of water from 0°C to its boiling point.If it takes another 80 min to turn all water into steam ,find the latent heat of vaporsation of water.

Light enters from air to diamond which has refractive index of 2.42. Calculate the speed of light in diamond . The speed of light in air is 3.0 xx 10^8 m s^-1