VOD for middle and high school - Electricity and magnetism

A magnetic field is created by the movement of electric charges through metal. The existence of a magnetic field creates a real force that influences its surroundings. This force depends on the direction of the current and the field (the direction of the field lines) and their intensity. There are a few simple rules for determining the direction of this force. In fact, you can see it simply by using your hand. The video demonstrates the force and shows how to identify its direction.

Wind has always been used as an energy source, whether for wind-powered sailboats or flour mills. As an energy source, it is endless. It is also used nowadays for electricity production. Its basic principle is quite simple, and is actually similar to hydraulic power stations: The wind turns a turbine, which spin magnets that produce electricity.

In this experiment we will take a regular balloon and make it sticks to the ceiling – in a way that looks like it is a light helium balloon which is lighter than the air.

בסדרת ניסויים שעשה ב-29 וב-30 באוגוסט 1831 גילה המדען מייקל פאראדיי כי הזזה של מגנט ליד חוט חשמל (או כל מוליך חשמלי) מייצרת בו מתח חשמלי. ההשפעות של תגלית זו נמשכות עד ימינו – כי היא הבסיס לייצור רוב החשמל בעולם.