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Energy Transformations. Magnetic Field- a region of space near a magnet, electric current, or moving charged particle in which a magnetic force acts on any other magnet, electric current, or moving charged particle. Insulator- A material that blocks the flow of electric current across it.

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Magnetic Field- a region of space near a magnet, electric current, or moving charged particle in which a magnetic force acts on any other magnet, electric current, or moving charged particle.

Insulator-A material that blocks the flow of electric current across it.

Energy- The ability to do work

Work- applying a force to an object over a distance, and (2) the object moves in response

to the force.

Newtons-SI units used to measure force.


  • Stored energy is chemical energy.

  • Heat outside is generated by solar energy.

  • If the particles in an object slow down, that means the temperature is cool or cold.

  • Form of energy in a battery is chemical energy.

  • How do I tell which car has the most kinetic energy? The one that is moving the fastest.


  • What is the energy transformation when a stretched rubber band is released? Potential energy transformed to kinetic energy.

  • What does the Law of Conservation of energy sat is true of all energy transformations? That energy is never created or destroyed and the sum of all the energies is constant.



  • Describe the energy transformation in an electric motor. supplied by food into Chemical energy transforms to electrical energy to mechanical energy.

  • If you wrap an electrical wire around an iron core, you create a electromagnet

  • An electric motor transforms electrical energy into mechanical energy.

  • How do you increase the strength of an electromagnet? Increase the number of times you wrap the wire around the iron core


  • What does a generator do? supplied by food into Converts mechanical energy to electrical energy.

  • What energy transformations occur when a hair dryer is plugged into the outlet? Electrical energy is converted to heat energy.

  • Describe the energy transformations in an electric fan. Electric energy to kinetic energy.


19 energy transformations
19. Energy Transformations supplied by food into

  • Light bulb is electrical to light energy and heat energy.

  • Door bell is electrical to sound energy.

  • Stove is electrical to heat energy.

  • Fan is electrical to mechanical


20. Describe the way heat moves. supplied by food into Heat moves in three ways: Radiation, conduction, and convection.

Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else.

Conduction is another way that heat moves through contact.

Convection happens when a substance that can flow, like water or air is heated.


Infrared heat lamps are used at fast food restaurants to keep food hot. How is heat transferred to the food? Radiation.

The water at the top of a pot of water gets hot by convection.

A cool metal spoon gets hot while sitting in your moms coffee. How does this happen? By conduction.


23. Explain keep food hot. How is heat transferred to the food? how a metal spoon gets hotter than a plastic spoon. Metal is a better conductor of heat than plastic. Plastic is an insulator.24. Same as above.25. True or false? A student lifting her books off the table is an example of work. True.


What instrument can be used to measure force? keep food hot. How is heat transferred to the food? Spring scale.

How do simple machines make work easier for you? Simple machines reduce the amount of force needed to do the work.

How can you adjust a lever to lift a heavy box? Move the fulcrum closer to the load.

How can you adjust a ramp to push a heavy object up the ramp? Make the ramp longer.


How do you adjust a pulley system to require the least amount of effort to lift a weight? Add more pulleys. Or add a moveable pulley.

What simple machine is found in raising blinds, lifting a car with a construction crane, and using a block and tackle? Pulley

Which of the following is not considered a simple machine?


A pair of scissors is made of amount of effort to lift a weight? wedge and lever.

A door knob is made of which simple machine? Wheel and axle

Of the following, which is an example of a complex machine? Can opener.


End of Study guide amount of effort to lift a weight?


Electromagnets – Activity 3.3 amount of effort to lift a weight?

Focus Question: How can you make a magnet that turns on and off?

  • Materials

  • 1 steel bolt

  • 1 electromagnet wire (very long wire)

  • 3 wires

  • 1 compass

  • 1 battery

  • 1 switch

  • 1 cup of paper clips

Challenge: Can you make a steel bolt into a magnet that will turn on and off? Test the rivet for magnetism by trying to move the washers.


Electromagnets – Activity 3.3 amount of effort to lift a weight?

Share with the class:

How did your group make a magnet that could turn off and on?


You need to know
You need to know… amount of effort to lift a weight?

An electromagnet is a piece of iron or steel with insulated wire wrapped around it. While electric current is flowing through the wire, the iron or steel becomes a temporary magnet.


Electromagnets – Activity 3.3 amount of effort to lift a weight?

What caused the electromagnet to become magnetic?

What happens when the switch is opened?

What happens when the battery is reversed or the wire connections are reversed?


You need to know1
You need to know… amount of effort to lift a weight?

To make an electromagnet stronger, you could

Increase the number of coils of insulated wire around the iron core

Or

Use more batteries or a battery with greater voltage in the electric circuit

Or

Increase the diameter of the core (use a thicker nail or rivet!)


Electromagnets
Electromagnets amount of effort to lift a weight?

Electromagnets: Using Electricity and Magnets Together

A Segment of: A First Look: Magnets (1:42)


Motors
Motors amount of effort to lift a weight?

An electromagnet is a very important part of a motor.

A motor changes electric energy to mechanical energy!


Explore Electric Motors amount of effort to lift a weight?

Activity 3.4

Focus Question: How does an electric motor transform electric energy to mechanical energy?

Follow the first and second student procedures outlined on page 43 of your Team Handbook


An electric motor contains an electromagnet that rotates between the poles of a permanent magnet.

electromagnet

Permanent magnet

Permanent magnet

The coil of the electromagnet is connected to a battery or other source of electric current.

When the current from the battery flows through the wire in the electromagnet it produces a magnetic field and becomes a magnet.

battery

Click on picture above for link with animations of a motor

Like poles of the magnets repel and unlike poles of the magnets attract. This causes the coil to rotate and thus changes electrical energy to mechanical energy!


What are between the poles of a permanent magnet. electric motors?

An electric motor is a device which changes electrical energy into mechanical energy.


How does an between the poles of a permanent magnet. electric motor work?

Go to the next slide 


Simple as that!! between the poles of a permanent magnet.


Apply making a motor activity 3 4
Apply – Making a Motor between the poles of a permanent magnet. Activity 3.4

Follow instructions on page 46 of Team Handout.

Pictures for some of the steps are shown in the following slides!


Step 2
Step 2 between the poles of a permanent magnet.


Step 3
Step 3 between the poles of a permanent magnet.

These 2 wires are NOT touching each other!


Step 4
Step 4 between the poles of a permanent magnet.

These wires are still not touching!


Step 6
Step 6 between the poles of a permanent magnet.


Step 7 watch the motor turn
Step 7: Watch the motor turn! between the poles of a permanent magnet.


We have seen how electricity can produce a magnetic field, but a magnetic field can also produce electricity!

Moving a loop of wire through a magnetic field produces an electric current.

A generator is used to convert mechanical energy into electrical energy.


Generating Electricity at a Power Plant but

A Segment of: Electricity and Magnetism: Generating Electricity


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