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attashe74 [19]
4 years ago
15

A transformer connected to a 120--V ac line is to supply 12.0V (rms) to a portable electronic device. The load resistance in the

secondary is 4.70 ohms
1) What should the ratio of primary to secondary turns of the transformer be?

N1/N2 = _________

2) What rms current must the secondary supply?

I = _________ A

3) What average power is delivered to the load?

P = ________ W

4) What resistance connected directly across the source line (which has a voltage of 120?V ) would draw the same power as the transformer?

R = ________ ohms
Physics
1 answer:
Troyanec [42]4 years ago
3 0

We don't know anything about the structure or materials of the real transformer, so all we can do is assume that it's ideal, with no losses.

1). <em>N1/N2 =</em> 120v/12v = <em>10:1</em>

2). <em>I =</em> V/R = 12/4.7 = <em>2.55 Amperes</em>

3). <em>Power =</em> V²/R = (12)² / 4.7  =  <em>30.64 watts</em>

4). Power = V² / R

R = V² / power

R = (120)² / (30.64 watts)

<em>R =  470 ohms </em>

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5. Which unit of electricity does the work in a circuit?
Pachacha [2.7K]

Answer:

Volt

Explanation:

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8 0
3 years ago
The distance between adjacent nodes in a standing wave pattern in a length of string is 25.0 cm:A. What is the wavelength of wav
mina [271]

A) 50 cm

B) 10000 cm/s

Explanation

Step 1

A)

If you know the distance between nodes and antinodes then use this equation:

\begin{gathered} \frac{\lambda}{2}=D \\ \text{where}\lambda\text{ is the wavelength} \\ D\text{ is the distance betw}een\text{ nodes} \end{gathered}

then, let

D=\text{ 25 cm }

now, replace to find the wavelength

\begin{gathered} \frac{\lambda}{2}=25 \\ \text{Multiply both sides by 2} \\ \frac{\lambda}{2}\cdot2=25\cdot2 \\ \lambda=50\text{ Cm} \end{gathered}

so, the wavelength is

A) 50 cm

Step 2

The speed of a wave can be found using the equation

v=\lambda f

or velocity = wavelength x frequency,

then,let

\begin{gathered} \lambda=50\text{ cm} \\ f=200\text{ Hz} \end{gathered}

replace and evaluate

\begin{gathered} v=\lambda f \\ v=50\text{ cm }\cdot200\text{ HZ} \\ v=10000\text{ }\frac{\text{cm}}{s} \end{gathered}

so

B) 10000 cm/s

I hope this helps you

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Density of water is 1000kg/m3. Find out the amount of mass of 5m3 water​
Licemer1 [7]

Answer:

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Explanation:

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Answer:

His weight would be 100 N

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