If an ideal cell of emf 5 volt shown in the figure gives a power of 10 W, find the powers consumed by the resistors `2Omega` and `1Omega`.

Options

A. 2W,18W
B. 8W,49W
C. 8W,18W
D. 2W,49W

Answer

B

Explanation

Since the cell gives out a power of 10W, a current 2A must flow through the cell towards left
`:.` Power consumed in `2 Omega` resistor
`=2^(2) xx 2 = 8W`
Total current flowing in `1 Omega = 7Amp`
`:.` Power consumed by
`1 Omega = 7^(2) xx 1 = 49 W`