Question

calculAte resistances

Answer 1

We can say that the three 7ohm resistors are parallel with each other.

Let P be the equivalent resistances of the three resistors.

So, (1/P) = (3/7)

P = 7/3 ohm.

Then, P and a 7 ohm resistor near the point B is in series.

Let Q be that equivalent resistance.

Q = (7/3) + 7 = 28/3 ohm

The remaining 7 ohm resistor and Q are in parallel.

Hence, The final resistance(say, R) be,

(1/R) = (3/28) + (1/7) = 49/196

R = 196/49 ohm.

Using Ohm's Law,

Voltage = Current × Resistance

= 1 × 196/49

Voltage = 196/49 V

Power = Voltage × Current

= (196/49) × 1

Power = 196/49 W.

-WonderGirl

Answer 2

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