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Three conductors draw currents of 1A, 2A...

Three conductors draw currents of 1A, 2A and 4A respectively, when they are connected in series across the same battery, the current drawn will be:

A

`3/7 A`

B

`5/7 A`

C

`2/7 A`

D

`4/7 A`

Text Solution

Verified by Experts

The correct Answer is:
D
`R_1 = V/1 " "R_2 = V/2 " "R_3 = V/4`
`R_s = R_1 + R_2 + R_3 = V/1 + V/2 +V/4 = (7V)/4`
`I_(ed) = V/R_s = 4/7 A`
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