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Three resistors of 4. 0, 6. 0, and 10. 0 ω are connected in parallel. if the combination is connected in series with a 12. 0-v battery and a 2. 0-ω resistor, what is the current through the 10. 0-ω resistor

Sagot :

The current through the 10 Ω resistor is 0.586A which is connected with a resistor in series combination.

Voltage divides in a Series combination and current divides in a parallel combination.

Let the three resistors joined in parallel be R₁, R₂, R₃

where, R₁= 4 Ω

R₂ = 6 Ω

R₃ = 10 Ω

Given, a battery of 12V and a 2Ω resistor say r is series with the parallel combination.

Equivalent resistance(R) in parallel combination is:

1/R = 1/R₁ + 1/R₂ + 1/R₃

1/R = 1/4 + 1/6 + 1/10

On solving, R = 1.9 Ω

Now, the Equivalent resistance(R) of parallel combination is in series with r = 2Ω

Let Equivalent resistance of Series combination be R'

R' = R + r

R' = 1.9 + 2 Ω

R' = 3.9 Ω

Now let's calculate the voltage drop in the resistor r = 2Ω

v = i × r           where, i is the current in r and v is the voltage drop across r

v = 3.07 × 2

v = 6.14V

Voltage drop, V' across the Equivalent resistance(R) in parallel combination = Total voltage - voltage drop in the resistor r

V' = 12 - 6.14 V

V' = 5.86V

Now, the Voltage drop, V' across the Equivalent resistance(R) in parallel combination is same for all the three resistors R₁, R₂, R₃

So, Voltage is same in a parallel combination.

V' = I × R₃

5.86 = I × 10

I = 0.586A

Hence, The current through the 10 Ω resistor is 0.586A

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