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45 Cards in this Set
- Front
- Back
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Electric force |
The force between charged objects |
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Electric field |
The region around a charged object where the object’s electric force is exerted on other charged objects |
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Conservation of charge |
The law that states that charges are neither created or destroyed. |
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Conductor |
A material that allows electric charges to flow |
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Insulator |
A material that doesn’t allow electric charges to flow |
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Static electricity |
A buildup of charges on an object |
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Electric current |
The continuous flow of electric charges through a material |
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Resistance |
The measure of how difficult it is for charges to flow through an object.
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Voltage |
The difference in electrical potential energy per charge between two places in a circuit. |
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Know the charges of protons and electrons. If you lose electrons, what charge will your object have? If you gain electrons, what charge will your object have? |
If I lose electrons the object will be positively charged while if you gain electrons the object will become negatively charged.
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Explain what happens with the following ways of charging objects and give an example of each. Make sure you understand the charges. |
Friction rubbing to objects together
ex. rubbing your feet, while wearing socks, on carpet Conduction electrons transferring from direct contact ex. when electrons from your socks transfer to your feet. electrons transferring through indirect contact ex. when you touch a doorknob and you get shocked Induction |
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Give 3 examples of conductors and insulators. |
Insulators: rubber, plastic, earth
Conductors: copper, iron, steel
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Explain the electrons in conductors and insulators. |
Electrons flow through conductors easily while they can’t flow through insulators easily. |
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What happens to electric forces as they get farther away from the charges? |
The atom becomes positively charged.
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What is static discharge? Give an example? |
A release of static electricity and an example of this is when you rub your feet on carpet and you get shocked by the doorknob. The shock is static discharge.
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Similar charges 1.____ and opposite charges 2.____. |
1. repel
2. attract |
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What happens when electric charges flow through a material? What do they produce? |
The material is now charged and produces an electric current.
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What are the 3 parts needed for an electric circuit? What is the part that is nice but not required? |
The three parts that are needed for a circuit are a wire, a power source, and a resonator. A part that would be nice, but is not required is a switch.
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What happens if one light bulb doesn’t work in both types of circuits? |
In a series circuit if you unscrew one light bulb the rest go out, but in a parallel circuit if you unscrew one light bulb the rest stay on.
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what does it mean if a switch is open on a circuit |
The circuit is incomplete, and their will be no power to the resistor.
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What happens if you add extra bulbs in both types of circuits? |
In a series circuit the brightness would go down. While in a parallel circuit, the brightness would stay the same.
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What is the unit for current? Resistance? Voltage? |
Current: Amps
Resistance: Ohms
Voltage: Volts
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What is Ohm’s Law? Be able to do simple calculations! |
Resistance equals volts divided by amps
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List the 4 factors that determine the resistance of an object. |
diameter, length, material, and temperature
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Also, be able to say whether something has more resistance or less resistance.
a thick wire or a thin wire
A long or short wire
A hot or cold wire
An insulator or a condutcor
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a thick wire and a thin wire A short wire and a long wire A hot wire and a cold wire An insulator and a conductor |
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What are some ways (3) that you are protected in your home from electrical fires? How do they protect you? |
fuses: They will melt when thing get too hot
circuit breakers: they will turn off when the electricity becomes over heated
the third prong: goes straight to the ground
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Magnet |
Any material that attracts iron and materials that contain iron. |
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Magnetic pole |
The ends of a magnetic object, where the magnetic force is strongest. |
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Magnetic force |
A force produced when magnetic poles interact. |
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Magnetic field |
The region around a magnet where the magnetic force is exerted. |
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Compass |
A device with a magnetized needle that can spin freely. |
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Magnetic declination |
The angle between geographical north and the north a compass needle points. |
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Electromagnetism |
The relationship between electricity and magnetism |
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What are the 3 properties of magnets? |
All magnets attract iron and materials containing iron, they attract or repel other magnets, and when they hang freely on a string one end will always point north.
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What are the strongest parts of a magnet |
The poles
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What happens if a magnet hangs freely on a string? |
One end will point north.
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What happens when you put magnets near each other?
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They either attract or repel based on which pole is facing the other magnet. |
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What does the arrangement of domains in an object have to do with a magnet? |
If the domains are arranged, then it is a magnet. If they are not arranged, then it isn’t a magnet.
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How is the Earth a magnet and why? |
It is a magnet do to its molten iron core.
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What kind of magnet can we compare the Earth to? |
A bar magnet
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What did Oersted determine? |
Where there is electricity there is magnetism.
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Compare and contrast a solenoid and an electromagnet |
A solenoid is a coil wire with a current while an electromagnet has a magnetic core therefore, strengthening the magnetic field. |
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What are the 4 ways you can strengthen an electromagnet. |
You can strengthen the current, use a more magnetic core, make the coils tighter together, and add more coils
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Why is an electromagnet very useful? Give 2 uses for electromagnets. |
You can turn an electromagnet on and off unlike a permeant magnet. Electromagnets are useful when it comes to lifting cars in a junk yard, and for making doorbells.
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How are electric current and magnetic field related? |
When you change the electric current, the magnetic field changes along with it. |
