questions

how does a bulb work? passing a current thru the filliment causeing it to heat up. why should you not touch the end of the head light bulb? the salt & greese from your hands will poof the bulb. how is the bulb conected to the electrical circut? bulb holder wires. why do we have two off set pins on a bulb? to ensure the correct placement & lightpath so you can locate it corectly.