This colour coding can be easily learned in the sequence “ B B ROY Great Britain Very Good Wife ”.
Combination of Resistors
1 . In Series ( i ) Equivalent resistance , R = R1 + R2 + R3
( ii ) Current through each resistor is same .
( iii ) Sum of potential differences across individual resistors is equal to the potential difference , applied by the source .
2 . In Parallel Equivalent resistance
1 / R = 1 / R1 + 1 / R2 + 1 / R3
Potential difference across each resistor is same .
Sum of electric currents flowing through individual resistors is equal to the be electric current drawn from the source .
Electric Cell
An electric cell is a device which converts chemical energy into electrical energy . Electric cells are of two types
( i ) Primary Cells Primary ceUs cannot be charged again . Voltic , Daniel and Leclanche cells are primary cells . ( ii ) Secondary Cells Secondary cells can be charged again and again . Acid and alkali accumulators are secondary cells .
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