Calculate the amount of heat produced per second (in calories ) when a bulb of `100 W ,220 W` glows, assuming that only `20 %` of electric energy is connected into light `J = 4.2 J cal^(-1)`

Calculate the heat produced in calorie when a current of 0.1 A is passed through a wire of resistance 41.8 Omega for 100 minutes.

How many electrone flow per second through as electric bulb rated 220V,100W?

How many electrone flow per second through as electric bulb rated 220V,100W?

A lead bullet strikes a target with a velocity of 500 ms^(-1) and the bullet falls dead. Calculate the rise in temperature of the bullet assuming that 40% of the heat produced is used in heating the bullet. Given specific heat of lead = 0.03 cal g^(-1).^(@)C^(-1), J = 4.2 J cal^(-1) .

Calculate the number of photons emitted by a 60 W bulb per second, if 10% of the electrical energy supplied to an incandescent light bulb is radiated as visible light.

100 J of heat is produced each second in a 4 Omega resistor. Find the potential difference across the resistor.

Only a fraction of the electrical energy supplied to a tungsten light bulb is converted into visible light. If a 100 W light bulb converts 20% of the electrical energy into visible light (lambda=662.6nm) , then the number of photons emitted by the bulb per second is

Calculate the electric field and magnetic field produced by the rediation coming from a 100 W bulb at a distance of 3 m. Assume that the efficiency of the bulb is 2.5 % and it is a point source.