Bellwork (3/7/14) What is alternating current (AC)? Mr. Z. will check off the H.W.

Today’s Agenda HomeworkBellwork Background info and notes Electricity demos

A – Radio B – Game System C – Elec. Motor D – Night Light E – Elec. Oven

Bellwork (3/7/14) What is alternating current (AC)? Electric current that repeatedly reverses direction in a cycle

Van de Graaff Notes 3/7/14

The Van de Graaff Generator Van de Graaff Generator: is an electrostatic generator which accumulates very high voltages on a hollow metal dome. Size of the dome determines the amount of charge it can store 150,000 V 8000 nC

Background Information For conductors: Charge builds up at pointed surfaces and spread out on smooth surfaces. Inside of conductors the electric field is zero.

The Van de Graaff Generator An aside note: Rubber Belts – cause the dome to be negatively charged Silk Belts – cause the dome to be positively charged

The Van de Graaff Generator

Electricity Demos Pre-Question: What are the three ways to charge an object? FrictionContactInduction

For each demos: (10 total) (a) Name of the demo (name) (b) Describe the demo (description) (c) The electric concept of each demo (concept)

The Van de Graaff Generator