Name the device that converts solar energy in to electrical energy.

A heat engine is a device that converts heat energy into mechanical energy. A refrigerator is a reverse heat engine. Can we decrease the temperature of a room by keeping the door of a refrigerator open? Explain.

Galvanic cell Is a device which converts chemical energy to electrical energy.Explain the mechanism of corrosion using electro chemical theory.

Galvanic cell Is a device which converts chemical energy to electrical energy.How many coulombs of electricity are required for the reduction of 1mol of MnO_4^- to Mn^(2+) ?

Galvanic cell Is a device which converts chemical energy to electrical energy.Give the diagrammatic representation of the cell Mg//MgSO_4 II CuSO_4//Cu . Write the half-cell reactions take place in this cell.

An A.C. generator is used to convert mechanical energy into electrical energy : But what does a transformer do?

AC generator is a device based on electromagnetic induction used to convert mechanical energy into electrical energy. How peak value of emf is related to its rms value?

A heat engine is a device which effectively converts heat energy into mechanical energy. State the law which describe this principle.