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3 years ago

Which of the following statements are true?

Physics

2 answers:

daser333 [38]3 years ago

5 0

Answer:

A voltmeter is used to measure voltage.

An voltmeter must be placed in parallel with a resistor to measure the voltage through the resistor.

An ammeter is used to measure current.

Explanation:

Voltmeter measures the voltage difference between two different points as connected in parallel not change the amount of current going through the element between those two points. So, an ideal voltmeter has very high resistance so that it doesn't "draw" current through it i.e loading effect.

Ammeter has almost negligible or very small resistance. As a result, it must be connected in series so that as much current can pass through it as possible. If it is connected in parallel, the circuit will be shorted and no current will pass through any electrical components connected in the circuit.

ale4655 [162]3 years ago

4 0

Answer:

A) True. Voltmeters measure voltages

C) True. They are placed in parallel

E) True ammeters are used to measure current

Explanation:

The devices for voltage measurement are the voltmeter and ammeter

Voltmeters have very high intense resistance and are placed in parallel

The ammeters have very small resist and are placed in series

Based on this establishment, let's analyze the statements

A) True. Voltmeters measure voltages

B) False has high intense resistance

C) True. They are placed in parallel

D) False ammeters are placed in series

E) True ammeters are used to measure current

F) False ammeters have a low internal resistance

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Explain the importance of measurement Physics.

KiRa [710]

Answer:

Measurements are an important part of comparing things, as they provide the basis on comparing objects to other objects. Measurements allow us to recognize three hours and see how it's shorter than five hours, without having to observe the hours passing by themselves.

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3 years ago

What substances were found in the innermost regions (within about the inner 0.3 AUAU) of the solar system before planets began t

julsineya [31]

Answer:

Hydrogen and helium compounds.

Explanation:

We know that the solar System was formed around 4.6 billion years ago, due to the gravitational collapse of a giant interstellar molecular cloud.

This cloud is a type of interstellar cloud and its density and size permit the formation of molecules, most commonly molecular hydrogen.

Therefore the principal substances were found before planets began to form are hydrogen and helium compounds, besides Rocks, metals, most of them in gaseous form.

I hope it helps you!

6 0

3 years ago

Viewed through a spectroscope, the spectral profile of a yellow street lamp has a narrow line in the yellow region of the visibl

muminat

Answer:

discrete lines are observed by the spectroscope, the emission of the lamp is of the ATOMIC source

Explanation:

Bulbs can emit light in several ways:

* When the emission is carried out by the heating of its filament, the bulb is called incandescent, in general its spectrum is similar to that of a black body, this is a continuous spectrum with a maximum dependent on the fourth power of the temperature of the filament.

* The emission can be by atomic transitions, in this case there is a discrete spectrum formed by the spectral lines of the material that forms the gas of the lamp, in general for the yellow emission the most used materials are mercury and sodium or a mixture of they.

Consequently, as discrete lines are observed by the spectroscope, the emission of the lamp is of the ATOMIC type

6 0

3 years ago

How do waves behave differently to Earth's interior as they encounter the boundaries of different mediums?

Natalka [10]

Answer:

Explanation:

When they encounter boundaries between different media, the waves react according to Snell’s law, and the angle of refraction across the boundary will depend on the velocity of the second media relative to the first

3 0

3 years ago

If a 66.0-kg person stands with both feet on the same step, what is the gravitational potential energy of this person on the fir

Leokris [45]

Answer:

U₁ = 129.4 J

Explanation:

The potential energy is

U = mg y - m g y₀

Where I correspond to the initial position, with this it is an additive constant, we can make it zero with the placement of the reference system, in this case the system is placed on the floor where the ladder rests.

The power power for people on the floor is

U₀ = 0 J

The potential energy for the person on the first step is

U₁ = m g y₁

In general the steps are 20 cm high

y₁ = 20 cm (1m / 100cm) = 0.20 m

U₁ = 66 9.8 0.20

U₁ = 129.4 J

8 0

4 years ago