Close

## Which is evidence that supports the dynamo theory Brainly?

Answer Expert Verified The correct answer is C: Earth’s outer core contains liquids that conduct electricity. According to the dynamo theory the outer core is said to be geodynamo.

## What supports the dynamo theory?

Answer. The correct answer is option B) Earth’s core contains a large amount of iron. The dynamo theory explains how celestial bodies develop magnetic fields. According to the theory, the magnetic field is generated by the motion of a rotating and electrically conducting fluid.

## How does Earth’s dynamo work?

In this dynamo mechanism, fluid motion in Earth’s outer core moves conducting material (liquid iron) across an already existing weak magnetic field and generates an electric current. (Heat from radioactive decay in the core is thought to induce the convective motion.)

## How does the dynamo effect create Earth’s magnetic field?

Illustration of the dynamo mechanism that creates the Earth’s magnetic field: convection currents of fluid metal in the Earth’s outer core, driven by heat flow from the inner core, organized into rolls by the Coriolis force, create circulating electric currents, which generate the magnetic field.

READ:   What is the term when a cross of red and white parents produces pink offspring?

## What is called dynamo effect?

Dynamo Effect. The dynamo effect is a geophysical theory that explains the origin of the Earth’s main magnetic field in terms of a self-exciting (or self-sustaining) dynamo. The electric current, in turn, produces a magnetic field that also interacts with the fluid motion to create a secondary magnetic field.

Kanika

Nikola Tesla

## Can I use DC motor as dynamo?

A dynamo is an electric generator made from coils of wires that are made to turn in a permanent magnetic field by way of a commutator. Essentially any electric DC motor with a permanent magnet can become a dynamo.

## What is the difference between Dynamo and DC motor?

A dynamo converts mechanical energy to electrical energy, whereas an motorconverts electrical energy into mechanical energy. A dynamo takes in motion and outputs electricity and amotor takes in electricity and outputs motion.

## How much electricity can a 12V DC motor generate?

It can produce over 1300 Watts which is 91 amps at 14.7 Volts – more than enough to charge anything, including car batteries.

## Which motor is best for generate electricity?

If it is a small power experiment, a stepper motor generates good power at lower rpm (revolutions per minute). Stepper motors can be obtained from old broken printers and scanners. This is one instructable that makes a light glow with stepper motor generator.

## How many rpm does it take to generate electricity?

1,000-1,800 rpm is the rotational speed required by most generators to produce electricity. The high-speed shaft drives the generator which produces AC electrical current.

## Can any motor be used to generate electricity?

You can use just about any motor to generate electric current, if it is wired correctly and you follow specific rules for its use. Modern AC induction motors are quite simple to wire as alternating current generators, and most will begin generating electricity the first time you use them.

## Can a fan motor generate electricity?

The fan is a bi-directional machine, so it can transform wind energy in mechanical energy without any change. In order to obtain electrical energy, it shall be necessary to make changes in the motor to obtain a generator. The design of these motors is very simple.

READ:   Why wolves were reintroduced to Yellowstone?

## What happens when the electric fan receives current?

A motor works when an electric current passes through a wire in a magnetic field. The fan converts electric energy into kinetic energy that does work, and it converts some electric energy into heat.)

## What is the fan that turns the magnet inside a generator called?

Answer. EXPLAINATION: The stator is a fixed structure that makes magnetic field, you can do this in a small dynamo using a permanent magnet. Large dynamos require an electromagnet.

## How many watts does it take to run a house?

In a typical home, essential items will average 5000 – 7500 watts of power to run.

## Will a 20kW generator run my house?

A 20kW generator will run most house receptacles, lights, and up to a 5-ton central air conditioner. You have a second air conditioner and heating system for the upstairs, but this area of the home is not important to you while operating on generator power.

## Is 10 KW enough to run a house?

Can a 10kW solar system power a home? Yes, a 10kW solar panels system will cover the average American household’s energy usage of about 10,649 kWh of electricity per year. 10kW solar systems do produce enough electricity that you could go off-grid..

## Will a 12000 watt generator run a house?

Whole House: Starting at about 12,000 watts, these generators can generally keep a home running without missing a beat. You’ll be able to run lights, fans, TVs, refrigerators, computers, space heaters and pretty much anything else you plug into an outlet.

## Will a 9000 watt generator run a house?

7000 to 9,000 Watts Air-cooled standby generators in this range provide enough power to keep essential home systems operating. Operating a sump pump, freezer, refrigerator, and furnace will use up to 4000 watts. A larger 9,000-watt standby unit could probably handle the additional load of a 1-ton air conditioner.

## How many watts does a home use daily?

The average U.S. home uses about 900 kWh per month. So that’s 30 kWh per day or 1.25 kWh per hour. Your average daily energy usage is your target daily average for to calculate your solar needs.

## Will a 10000 watt generator run a house?

A 10000 watt generator has got enough power to run all critical household items. These include a refrigerator and freezer, sump pump, furnace, window air conditioner, and light circuits. In most situations, you can run most, if not all, of these devices at the same time.

READ:   What part of the female body produces estrogen?

## How big of a generator do I need to run my whole house?

You can run the most critical household equipment with a generator rated at 5,000 to 7,500 watts. These include things like a well pump, refrigerator and freezer, and lighting circuits. A generator with around 7500 running watts can run all these appliances at once. For RV, a 3000 – 4000-watt generator would be ideal.

## What will a 4000 watt generator run in a house?

Figure about 4,000 watts to run essentials like a refrigerator, stove and some lights in smaller home and closer to 8,000 to power everything except a central air conditioning system in a a house up to 3,000 square feet. An electric stove might require at least 2,000 watts, a microwave 1,000.

## What size generator do I need for a 200 amp service?

If you have a 200 Amp service panel, use a 15-20 kW GenSet (again use the larger size if you have air conditioning or large well pump). If you have a 400 amp service panel, use a 30-50 kW GenSet (if you have lots of air conditioning or other larger loads use the large size in the range).

## How many amps is 20000 watts?

Equivalent Watts and Amps at 12V DC

Power Current Voltage
220 Watts 18.333 Amps 12 Volts
230 Watts 19.167 Amps 12 Volts
240 Watts 20 Amps 12 Volts
250 Watts 20.833 Amps 12 Volts

## How many kW is an amp?

You can use this kilowatt to amperes converter. Below you will find 3 examples of a kW to Amps conversion for: 4 kW central air conditioner (220 V)….kW To Amps Calculator.

Power (kW) Voltage (220 V) Amperage (A)
1 kW to Amps: 220 V 4.55 Amps
2 kW to Amps: 220 V 9.09 Amps
4 kW to Amps: 220 V 18.18 Amps
6 kW to Amps: 220 V 27.27 Amps

## How do you determine what size generator you need?

Identify the device you want to power. Check the product’s owner’s manual to determine how much wattage the device needs to run. Multiply the running wattage of the device by three. Add the running wattage to the starting wattage for the total wattage the device needs to operate.

2021-05-14

## Which is evidence that supports the dynamo theory Brainly?

Answer Expert Verified The correct answer is C: Earth’s outer core contains liquids that conduct electricity. According to the dynamo theory the outer core is said to be geodynamo.

## How does Earth’s dynamo work?

In this dynamo mechanism, fluid motion in Earth’s outer core moves conducting material (liquid iron) across an already existing weak magnetic field and generates an electric current. (Heat from radioactive decay in the core is thought to induce the convective motion.)

## What does the dynamo theory state?

In physics, the dynamo theory proposes a mechanism by which a celestial body such as Earth or a star generates a magnetic field. The dynamo theory describes the process through which a rotating, convecting, and electrically conducting fluid can maintain a magnetic field over astronomical time scales.

## What is dynamo effect class 12?

The magnetic field of the earth is thought to arise due to electrical currents produced by convective motion of metallic fluids (consisting mostly of molten iron & nickel) in the outer core of the earth. This effect is also known as the dynamo effect.

READ:   What is the substance produced by a chemical reaction called?

## Why is Earth like a magnet?

Earth’s magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields. From afar, the Earth looks like a big magnet with a north and south pole like any other magnet.

## What is eddy current class 12th?

Answer Verified. Hint: Eddy currents are currents induced in the body of the conductor when they are subjected to changing magnetic flux. They are also called as Foucalts currents.

## What is the disadvantages of eddy current?

Disadvantages of Eddy Currents: There is a major heat loss during cycling eddy currents due to friction in the magnetic circuit, especially where the core is saturated. Thus there is the loss of useful electrical energy in the form of heat. There is magnetic flux leakage.

## Why is it called eddy current?

Eddy currents are named so because the current looks like eddies or whirlpools. When a conductor is placed in the changing magnetic field, the induced current in the conductor is termed as Eddy currents.

## Is eddy current used in electromagnet?

An Eddy current can be produced by both electromagnets and permanent magnets, as well as transformers and by the relative motion generated when a magnet is located next to a conducting material. Eddy currents are used in specific applications, including non-destructive testing, which are discussed in this article.

## What are the advantages of eddy current?

The advantages of eddy current testing are: Sensitivity to surface defects. Able to detect defects of 0.5mm in length under favourable conditions. Can detect through several layers.

## Are eddy currents useful or harmful?

An eddy current is a current set up in a conductor in response to a changing magnetic field. They flow in closed loops in a plane perpendicular to the magnetic field. Eddy currents transform more useful forms of energy, such as kinetic energy, into heat, which isn’t generally useful.

## Why do cars not have eddy current brakes?

Eddy current brakes dissipate the energy from braking in the form of heat. Contrary to regenerative braking (in such cars as a Tesla or Prius) you cannot use that energy to charge the cars battery. The high speed and weight of these trains would wear out conventional brakes in no time.

READ:   How do fungi differ from plants?

## How can we prevent eddy currents?

Eddy currents are minimized in these devices by selecting magnetic core materials that have low electrical conductivity (e.g., ferrites) or by using thin sheets of magnetic material, known as laminations. Electrons cannot cross the insulating gap between the laminations and so are unable to circulate on wide arcs.

## How do you find eddy currents?

If the material contains a crack or flaw which make the spatial distribution of the electrical conductivity nonuniform, the path of the eddy currents is perturbed and the impedance of the coil which generates the AC magnetic field is modified. By measuring the impedance of this coil, a crack can hence be detected.

## How does eddy current braking work?

Unlike mechanical brakes, which are based on friction and kinetic energy, eddy current brakes rely on electromagnetism to stop objects from moving. Eddy currents are created when a conductor passes through a magnetic field, which creates opposing forces that spin inside the conductor.

## What are the 4 types of retarders?

Retarders are mechanisms in some vehicles that help slow the vehicle and reduce the need for braking. The four basic types of retarders are exhaust, engine, hydraulic, and electric.

## How does electromagnetic braking system work?

When electricity is applied to the coil of an electromagnet, the magnetic flux attracts the armature to the face of the brake. As it does so, it squeezes the inner and outer friction disks together. The hub is normally mounted on the shaft that is rotating. The brake housing is mounted solidly to the machine frame.

## What are the types of braking system?

Types of Braking Systems and Types of Brakes

• Hydraulic braking system: This system runs on brake fluid, cylinders, and friction.
• Electromagnetic braking system:
• Advantages of Electromagnetic braking system:
• Servo braking system:
• Mechanical braking system:
• Types of Brakes:
• DISC BRAKE.
• DRUM BRAKES.

## Where are electromagnetic brakes used?

Disk electromagnetic brakes are used on vehicles such as trains, and power tools such as circular saws, to stop the blade quickly when the power is turned off.

## What is the main concept of electromagnetic brakes?

The basic work of an electromagnetic brake is to reduce speed of the vehicle using electromagnetic force to induce a mechanical frictional resistance within the wheels. These kind of brakes operate through an electric actuation, but transmit torque mechanically.

READ:   What type of cell division takes place in sex cells?

## What is a hysteresis brake?

Product Description. Pure Hysteresis Brakes produce torque strictly through a magnetic air gap without the use of magnetic particles or friction components.

Granville Woods

## Which of the following is a common method of braking a motor?

Two common basic methods used for braking a motor are DC injection braking and dynamic braking.

## Which of the following is the best braking method?

Explanation: Plugging is the best braking method among all braking techniques. In plugging the value of the armature current reverses and the mechanical energy is extracted. A very high braking torque is produced in case of plugging. 2.

## Which motor is used in regenerative braking?

In single stage electric braking method, the braking and energy regeneration are achieved by the use of single stage bidirectional DC/AC converter which is used to drive the BLDC motor. The BLDC motor driven by a single stage bidirectional converter is shown in Fig. 1.

## What is the relation between rotor speed and synchronous speed?

The synchronous speed refers to the stator rotating magnetic field, which depends on the number of poles and frequency. The other speed is the rotor’s. The rotor speed will be always slower than the stator speed, we call it slip. Without the slip, the squirrel cage induction motor doesn’t have torque.

## What is relation between synchronous speed and frequency?

The Synchronous Speed is given by the relation shown below. The above equation (1) shows that the rotor speed N bears a constant relationship with the field poles and the frequency of the generated voltage in the armature winding….Synchronous Speed.

Number of Poles Synchronous Speed NS in r.p.m
2 3000
4 1500
6 1000
8 750

## What is synchronous speed?

: a definite speed for an alternating-current machine that is dependent on the frequency of the supply circuit because the rotating member passes one pair of poles for each alternation of the alternating current.

## What is the slip?

Slip is the differentiation between synchronous and asynchronous speed. The difference between the synchronous speed of the electric motor magnetic field, and the shaft rotating speed is slip – measured in RPM or frequency. Slip increases with increasing load – providing a greater torque.

2020-02-23