Write an expression for the amount of heat produced in a wire of resistance R and carrying a current I for time. An electric heater of resistance 10 ohm draws 15 A from the service mains for 2 hours. Calculate
the power of the heater.

Write an expression for the amount of heat produced in a wire of resistance R and carrying a current I for time. An electric heater of resistance 10 ohm draws 15 A from the service mains for 2 hours. Calculate the heat developed in the heater?

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

Write an expression for the magnetic field produced by an infinitely long straight wire carrying a current I, at a short perpendicular distance a from itself.

State the relationship between the power P, consumed by a device, its resistance R and current I, flowing through it An electric iron of resistance 20 ohm takes a current of 5A.Calculate its electric power?

State the relationship between the power P, consumed by a device, its resistance R and current I, flowing through it An electric iron of resistance 20 ohm takes a current of 5A.Calculate the heat generated by it in 30 seconds.

The resistance of an electric heater is 25 Ohm . Its ends are connected to the poles of a 90V dry battery. How much current will flow in the heater wire?

A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad s^-1 in a uniform horizontal magnetic field of magnitude 3.0xx10^-2 . Obtain themaximum and average emf induced in the coil. If the coil forms a closed loop of resistance 10 Omega , calculate the maximum value of current in the coil. Calculate the average power loss due to Joule heating. Where does this power come from?