How Things Work / TUNE - Fall 2017

The sheet of notes is still permitted. The topics for the final exam are: electrical charge proton, neutron, electron, quark - particles; which are fundamental and which are composite  atomic number and elements Coulomb's law charging things - what happens voltage current resistance units of V, I and R series circuit parallel circuit basics of circuits bulb brightness predictions - it's related to current (and series vs. parallel) V = I R basic electrical schematics (and symbols - battery, resistor, wire) magnetism electromagnetism electromagnetic induction compasses finding north magnetic north vs. geographic north

1.  Why is it that electrons are the easiest particles to manipulate? 2.  What does atomic number (Hydrogen = 1, Helium = 2, etc.) mean? 3.  If two charged particles are pulled apart to 3 times their original distance of separation, how exactly will the force between them change? 4.  A 5-ohm resistor is connected to a 10-volt battery. What current goes through the resistor? 5.  Draw the symbols for battery, resistance and wire.  Draw a schematic for 2 resistors in series.  Draw a schematic for 2 resistors in parallel. 6.  What is strange about magnetic north on the Earth?

Magnetism! Similar to the case of charge, magnetic poles are divided into North and South poles. A North magnetic pole is one that points toward the Earth's magnetic north pole.  This means that the Earth's magnetic north is ACTUALLY A SOUTH POLE (magnetically speaking). Also: - Like poles repel - Opposite poles attract - Each magnet must have at least one North and one South pole (though they may have more than one of each).  There is NO such thing as a magnetic monopole. - Magnetic fields are real, but the lines are imaginary - Field lines indicate the direction that a compass needle would take in the vicinity of the magnetic field. - There are naturally occurring magnetic minerals - a very common one is called magnetite (Fe3 O4) Magnetic north on the Earth is near Ellesmere Island in Northern Canada, several hundred miles from true (geographic) North (the North Pole).  It is moving toward Russia at several miles per year. For gory detail: http://en.wikipedia.org/wiki...