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what is a series circuit
circuit components are connected in a single loop, one after another.
how does the charge flow
The same flow of charge passes through each circuit component and so the current is the same in every component
equation for series Circuits
I total= I1 = I2=I3=…
what’s the roles of battery or cells
provides the supply of potential difference to the circuit.
The potential difference is shared between the other components.
resistance adds up to equation
R total=R1+R2+R3+...
parallel circuits
components are connected in separate loops.
how does charge flow in parallel circuits
through one of the loops and so current is shared between loops. So the supply current in the loop with battery is equal to the sum of the current in the other loops:
Is=I1+I2+I3+...
The potential difference is the same in every loop:
V1=V2=V3
Note 
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