Electronics - Parallel Circuits - Discussion

12. 

In the given circuit, Channel 1 of the stereo amplifier outputs 12 V to the speakers. How much total power is the amplifier delivering to the speakers?

[A]. 0 W
[B]. 18 W
[C]. 36 W
[D]. More information is needed to find the total power delivered to the speakers.

Answer: Option C

Explanation:

No answer description available for this question.

Swathi said: (Dec 5, 2010)  
p= v*i
=> v^2/r
where r= 8 parellel 8
8*8/(8+8)=4
hence 12*12/4=36

Navin said: (Dec 22, 2010)  
p1=24*24/8=18
p2=24*24/8=18
total power=p1+p2=36

Ilavarasan said: (Jul 18, 2011)  
p=v*i
v=12,
i=?

R=r1*r2/r1+r2
=8*8/8+8
=64/16
R=4

v=ir
i=v/r
=12/4
i=3


p=vi
p=12*3
p=36

Ankit V said: (Aug 1, 2011)  
In given circuit two resistors are in parallel so effective resistance is 4 ohm and we know P=V*V/R.

So after calculate P= 36 W

Dilip said: (Oct 20, 2011)  
First find current,
I=V/R
where R=R1*R2/R1+R2
i.e., 8*8/8+8=4ohm
I=12/4=3A

then,
P=VI
P=12*3=36 watt.

Saurabh Kumar said: (Jul 10, 2012)  
With reference of product over sum.

X1X2/X1+X2.

R1=8.

R2=8.

So then,

R=R1R2/R1+R2.

8*8/8+8=64/16=4ohm.

Given voltage=12v.

Then,

I=12/4.

=3A.

So that,

P = VI.

P = 12*3 = 36W Answer.

Shaikh said: (Aug 13, 2012)  
w = v2/R.

v =12.

Rt = (r1*r2)/(r1+r2) = 4 ohm.

w = 144/4.

= 36.

Asif Vellore said: (Apr 12, 2013)  
Power formula is 3 type:

1) p=i^2*r

2) p=v^2/r

3) p=v*i

Take a 2 formula for this question p=V^2/R.

FOR 1ST SPEAKER P=144/8 =18W.
FOR 2ND SPEAKER P=144/8 =18W.

TOTAL POWER OF SPEAKER IS = 36W.

Roja said: (Jun 10, 2015)  
p = v*i.
v = 12v.
i = i1+i2.

i1 = v/r1 = 12/8 = 3/2MA.
i2 = v/r2 = 12/8 = 3/2MA.

i = 3/2+3/2 = 3MA.
p = v*i = 12*3 = 36W.

Harshvardhan Nirmal said: (Jun 12, 2015)  
p=vi, but v=ir.

Therefore. p=i^2r.

r=8*8/8+8=4.

i=v/r v/r=12/4=3.

p=v*(v/r).

p=12*3=36W.

p=36W.

Pre said: (Jun 15, 2016)  
p = i^2 * r.

r = r1 * r2/r1 + r2.
=> 8 * 8/8 + 8,
=> 64/16,
=> 4,
r = 4.

Don't we know I?

So that;

i = (v/r).
p = (v/r)^2 * r,
p = ((12/4)^2) * 4,
p = (3^2) * 4,
p = 9 * 4,
p = 36.

Then the answer is 36- (c).

Krunal said: (Nov 4, 2016)  
p = v * i
v = 12,
i = ?

R = r1 * r2/r1 + r2.
= 8 * 8/8 + 8,
= 64/16,
R = 4.

v = ir,
i = v/r,
= 12/4,
i = 3.

p = vi.
p = 12 * 3,
p = 36.

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