Flow of electricity
What is a current
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A cell stores chemical energy that can be changed to electrical energy in circuit .
A battery contains two or more cells joined together
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what is terminals
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The cell in the circuit has two connections, called terminal
more about Electron
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electrons in metal are free to move.
that means they can move through the metal,
electrons also move randomly.
also electrons have negative energy
that make oppsite charges attract, and like charges repel
example: positive and negative attract, positive and positive repel negative and negative repel
what is the advantage of circuit diagrams
circuit diagrams are easier to draw
the components have standars sysmbol
wires are drawn with straight lines, which easy to intepret
circuit symbols
measuring current
current is measured in units called amps and amps has a symbols A
Ammeters are always connected in series with other components in a circuit if the components are connected in the series they are all connected end-to-end ,one after another, and there are no branches in the circuit
conductor and insulator
all metal are conducters and wires that carry electric current
conductor means allow electric current to flow through a material that is electron free to move
insulator are materials that do not allow current to flow through that means that the electrons are not free to move and insulator are inhibit electron flow
example of insulator is the plastick that cover the wire