Physics
Difference between Series and Parallel Combination
Difference between series combination and parallel combination
series combination 
parallel combination 
Definition 

In series, combination are joined end to end.  In parallel combination, one end of each resistor is connected to one terminal of the battery while the other end of each resistor is connected to the second terminal of the battery. 
Path 

There is only a single path for the passage of current.  There are multiple paths for the passage of current. 
Amount of current 

The same amount of current passage through each of these resistors.
Formula 
Different amounts of current pass through each resistor. The Sum of all current is equal to the total current supplied by the battery.
Formula 
Potential difference 

The sum of potential differences across individual resistors is equal to the total voltage of the battery.
Formula 
The potential difference across each resistor is the same and is always equal to the voltage of the battery.
Formula 
Net resistance 

Net resistance of all the resistors is equal to the sum of individual resistance.
Formula 
Net resistance of all the resistors is equal to the sum of reciprocal of individual resistors.
Formula 