gaara Posted December 19, 2006 Share Posted December 19, 2006 hello im trying to learn the fundamentals of electricity an im stuck already "questions to understand electricity #1 What is the stuff that flows through a light bulb and comes back out again through the other wire? #2 What is the stuff that flows into a light bulb and gets changed entirely into light and heat? " i can understand question 1, its electric charge... bla bla but question 2 i dont get, i can understand where the b field and e fields come from .. but the site im learning from says "THE ENERGY FLOW (POYNTING FIELD): Electromagnetic energy flows out of the battery and into the empty space around the circuit. It flows parallel to the connecting wires, then it dives into the resistor. The field of energy flow is found by multiplying the e-field by the b-field (E x B vector cross-product.)" So is it the electrons experiencing "friction" in the light bulb's filament that produces heat then light? or is it the EM energy? i dont get it... its too unclear ... an is it also why when you turn on the light it comes on instantly? cause the EM energy is travelling at the speed of light? Ive searched the net for ages about electricity an these EM energy concepts but i cant find anything.. so if anyone konws a site that makes it clear just post the link please! Link to comment Share on other sites More sharing options...
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