“Magnets are surrounded by an invisible magnetic field that is made by the movement of electrons, the subatomic particles that circle the nucleus of an atom”
“Every magnet has both a north and a south pole. When you place the north pole of one magnet near the south pole of another magnet, they are attracted to one another. When you place like poles of two magnets near each other (north to north or south to south), they will repel each other.”
1 Watt = 1 joule/second
650 watts = 650 joules/second
(650 J/sec) x (3,600 seconds/1 hour) = <em>2,340,000 Joules/hour</em>
The first law of thermodynamics says that the variation of internal energy

of a gas is equal to the amount of heat Q supplied to the gas minus the work W done by the gas:

The variation of internal energy of a gas is:

As it can be seen, it depends only on the variation of temperature

. Since for an isothermal process

, then

. This means that the first law of thermodynamics becomes

and since the work done is 370 J, then the amount of heat is also 370 J:

.