Question

Two conductors A and B of resistances 5ohm and 10 ohm repectively can be arranged in parrallel and later on in series.In each arrangement t the total voltage applied across it is 20 volts. In which arrangement will the voltage across A and B be the same and in which case will the current flowing through A and B be the same ? Calculate the total resistance for each arrangement

Answer 1

WHEN CONNECTED IN PARALLEL >
1/R =1/R (I) +1/R (2)
THEREFORE TOTAL R = 5.4 OHM
WHEN CONNECTED IN SERIES >. 
R = R (1) +R (2)
THEREFORE TOTAL R = 15 OHM