CBSE Class 10  Resistors in Series and Parallel Videos
Cost of electricity
This video describes the calculation of cost of electricity for electrical appliance
 find the new resistance of wire length l area of cross section A if it is folded 4 times

finding the net resistance
 the resistance of a wire of 0.01 cm radius is 10 ohm.if the resistivity of the material of the wire is 50*10^8 ohm meter find the length of the wire
 Nichrome wire of length L and radius R has resistance 10 ohm.How would the resistance of the wire change when: only diameter of the wire is doubled?Justify
 A given length of a wire is doubled of itself and this process is repeated once again.By what factor does the resistance of the wire changes?
 A 6 ohm resistance is doubled by folding,what is the new resistance?

Equivalent resistance
 & Resistances of three resistors are given as R, = 10 2, R= 20 2 and R, = 30 12. Calculate the effective resistance when they are connected in series. Also calculate the current flowing when the combination is connected to a 6 V battery.
 A wire of length 22.5 cm and resistance was 20 © and the diameter was 0. 3mm then what is the resistivity of the material .