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flow of electrons from the negative to the positive terminal of a battery .
direct current
current reverses its ' direction periodically .
alternating current
Conductors Insulators
2 types of resistors
these are materials that have a very low resistance to current flow . they heat up quickly and cool off quickly ex metals
Conductors
these are materials that have a high resistance to current flow . They heat up slowly and cool off slowly ex ) non metals , glass , rubber , water etc
Insulators
resistors are linked one after the other making only 1 path for the current travel from the - to the + terminal of the battery .
series circuits
resistors are connected in a ladder more than one path for current to travel
Parallel circuits
Rt = R1 + R2 + ......
Series circuit formula for total resistance
1 / Rt = 1 / R1 + 1 / R2 + ....
PARALLEL CIRCUITS : the total resistance formula