Electricity

Katya Heredia, Ally Harris, Zach Johnson, & Keith Goings

circuits

A circuit is a closed loop that electrons can travel in. Every electrical appliance in your home, whether it's battery operated or you plug it in, is a circuit. There can not be a break in a circuit because the electrons need to flow through the circuit in order for it to function.
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Electrons

  • flow is determined by the battery
  • flow is always from negative to positive
  • electron loss=object is positively charged
  • electron gain=object is negatively charged
  • electrons that are bound loosely are conductors (metals and glass)
  • electrons that are bound tightly are insulators (plastic, wood, and RUBBER)
  • opposite charges attract and negative charges rebel

Bulbs

  • are resistors because they resist current flow
  • more bulbs=decrease in current and bulb brightness
  • contact points (CP's) allow electrical current to flow
  • have 2 CP's and each CP must touch another CP of another device

Series Circuits

  • single current paths
  • current is always the same throughout the circuit and is measured in Amps
  • resistance total is all resistors combined
  • resistors represent a given amount of resistance in a circuit and DO NOT have to be the same value (bulbs)
  • resistance is the hindrance to the flow of the charge measured in Ohms
(measure of "how hard" it is to "push" through a circuit element).
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Ohms Law

Formula: V=IR

(V = volts; I = current/Amps; R = resistance/Ohms)

Our Circuit

  • simple circuit
  • lever, 2 alligator clips, 1 resistor (bulb), and a battery

Fake scenario using Ohms Law for our circuit:

Zach is using his handy-dandy straightener to straighten Keith's hair for picture day. The straightener draws a current of 2.26 Amps on a 5.87 V outlet, how much resistance would the straightener draw?