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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