Physics, 08.04.2020 03:18 lakaralake11

The 250 - turn primary coil of a step‑down transformer is connected to an AC line that is 120.0 V (rms). The secondary coil is to supply 12.0 A (rms) at 9.60 V (rms). Assuming no power loss in the transformer, what is the number of turns N s in the secondary coil? N s = turns What is the rms current i p, rms in the primary coil?

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Answer from: alyssaarnold230

Number of turns in secondary is 20

Current in primary is 0.96 A

Explanation:

We have given number of turns in primary N_p=250

Voltage across primary of transformer V_p=120volt

Current in secondary coil i_s=12A

Voltage across secondary V_s=9.6volt

For transformer we know that $\frac{N_p}{N_s}=\frac{V_p}{V_s}$

So $\frac{250}{N_s}=\frac{120}{9.6}$

N_p=20

So number of turns in primary is 20

Now $\frac{N_p}{N_s}=\frac{i_s}{i_p}$

$\frac{250}{20}=\frac{12}{i_p}$

i_p=0.96A

Current in primary of transformer is 0.96 A

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

That depends on what kind of environ meant it is in in space it has the same force that was applied when the velocity was gained

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The 250 - turn primary coil of a step‑down transformer is connected to an AC line that is 120.0 V (r...

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