1. Electricity Notes 2 Charging - Transfer of electrons (e - ) from one place to another. Caused by contact or induction. Charge by Contact – when a ___________ charged object is placed in CONTACT with a __________ object, some _________ ( ) Will move to the neutral object. negatively neutralelectrons e- Example: Friction Rubbing feet w/ socks on floor Combing dry hair in the winter http://www.youtube.com/watch?v=3K1Yzn zxQmw

2. Charge by Induction Charge by Induction – when a charged object ______ a conducting surface like a _______ will cause the _________ ( ) in the conducting object to move as far away as possible. NEAR metalelectrons e- Diagram: BeforeAfter ++++++

3. Conductors Conductors - _______, they can make an electric current because … __________________________________ ________ is the best conductor. ________ is the best affordable conductor. metals one or more of their electrons are not anchored so they wander. (has loosely arranged electrons.) Gold Copper

4. Insulators/Semiconductors Insulators - ________ & ______, because the electrons are _______ ________ Do not wander. rubberglass tightlybound Semiconductors - _________ & _______, behave sometimes as an __________ and sometimes as a __________. They are used in transistors which control the flow of ________ in _________. GermaniumSilicon insulator conductor current circuits

5. Superconductors Superconductors - _________ ( ) flow indefinitely in certain materials at very ____ ____________ (no electrical __________, because no _____ _____. electrons temperatures resistance heatloss low e-