In the series combination, the resistances are joined end to end. For a series combination of resistors, Rs = Ri and current through
each resistor is same but their potential difference between their
ends are different according to their resistors. When two or more
resistors are combined in such a way that their first ends are
connected to one point and the second ends to another point. In a
parallel combination of resistors 1/Rp = 1/R1 + 1/R2….. And
potential drop across each resistor is same but current in different
resistances are different.
1x 4
19(i) If we connect n bulbs each with a rated power P in series, what is the total power
consumed by combination at rated current?
a)Pn b) P/n c) n/P d) P/2n
1
19(ii) Connect n bulbs each with a rated power P in parallel, what is the total power consumed
by combination at rated voltage?
a) 2pn b) n/p c) p/n d) np
1
19(iii) The power consumed by n equal resistance in parallel is x times that
of power consumed in series, if the voltage supply is same. Find the
value of x.
a) 1/n2
b)n2
/R c) n2
d) 1/n
1
19(iv) Resistors 4, 5 and 6  are connected in series with 5 V battery, the total power
consumed by the combination is
a)3/5 W b) 10 W c) 5/3 W d) 5 W
1
19(v) If resistors, 2, 3, 5 are connected in parallel with 10 V battery,
calculate the total power consumed by the combination is
a)3000/31 W b) 310/3 W c) 30 W d) 310