PHYS 101 Pre-Lab #3

# PHYS 101 Pre-Lab #3 - PHYS 101-20 Lab#3 Electric...

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10/3/07 PHYS 101-20 Lab #3 – Electric Circuits (Ohm’s Law) Objective : To accurately determine the current, voltage, or resistance of a given circuit using Ohm’s Law. Electrons are the carriers of charge in any atom in the universe. An atom is charged positively when there are fewer electrons orbiting the nucleus then there are protons inside the nucleus, and charged negatively when there are more electrons orbiting the nucleus than there are protons inside the nucleus. All charges flow from negatively charged systems to positively charged systems. The flow of electrons from one system to another creates a current in the wire that carries it. Current is measured in amperes, or 6.25*10^18 electrons per second. The direction of the current flow is in the opposite direction of the flow of electrons. There are generally two arrangements of currents for electrons to flow through. A series circuit has the resistors set up in a straight line, whereas a parallel circuit has more than one path for electrons to travel through resistors. Ohm’s Law – V = IR

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PHYS 101 Pre-Lab #3 - PHYS 101-20 Lab#3 Electric...

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