Question

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Answer 1

Answer:

a) so that the current remains the same and voltage differs

b) when connected in series the resistance increases as the no. of devices increases.

c)R1+R2=Total resistance

30+15=45ohm

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Answer 2

1. Umesh should connect bulbs line wise .

2. firstly the bulbs are connected line by line. over all resistance will be high and the current will be low. so the filament of the bulb will not burnt.

3. the effective resistance circuit will be

R 1 + R2 = total total resistance

30 + 15 = 45 ohm