The heating element connected to 230V draws a current of 5A. Determine the amount of heat dissipated in 1 hour (J = 4.2 J/cal).

true or false: 1J = 4.18 cal

Choose correct alternative. A potential difference of 20 V is applied across the ends of a coil. The amount of heat generated in it is 800 cal/s. The value of resistance of the coil will be

What current flowing through a resistance coil of 10 ohm would produce 70 cal/min? J = 4.2 J/cal.

A body of mass 2 kg is being dragged with uniform velocity of 2 m / s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 sec is . (4.2"joule"//cal and g=9.8 m//s^(2))

An inductor draws 5A of current at 230 V, 50 Hz. Find the value of inductive reactance and the inductance.

A transformer has 250 volts applied to the primary and gives 4.6V in the secondary. The secondary is connected to a load which draws a current of 5A. The current in the primary is

A Flashlight usestwo 1.5V batteries to provide a steady current of 0.5A in the filament. Determine the resistance of the glowing filament.

Three capacitors of capacitances 2 pF, 3 pF and 4 pF are connected in parallel. Determine the charge on each capacitor if the combination is connected to a 100 V supply .

Solve the following problems : 20 g of water is given 2090 j of heat . Determine the change in the temperature of water .

A black body at 227^(@)C radiates heat at the rate of 7 cal cm^(-2) s^(-1) . At a temperature of 727^(@)C , the rate of heat radiated in the same unit will be