Subatomic Particles
Electric Charge & Forces
Electric Fields
Electric Current
Touch Screens
100
This is the positively charged particle found INSIDE the nucleus of an atom.
What is a proton?
100
These are the two types of electric charge.
What are positive and negative charges?
100
This is the force field surrounding an electrically charged object.
What is an electric field?
100
This is a FLOW of particles with an electric charge.
What is an electric current?
100
This is a working model of a design solution that can be used for testing and refining the design.
What is a prototype?
200
This is a negatively charged particle, which is located AROUND the nucleus of an atom.
What is an electron?
200
This happens when two objects that have OPPOSITE charges interact.
What is: they will ATTRACT each other?
200
This is true about the strength of an electric field when the field lines are CLOSE TOGETHER.
What is a STRONG electric field?
200
This type of material is a good conductor.
What are: Most types of metal or seawater.
200
This allows a person's FINGER to interact with a touch screen.
What is: skin is a conductor?
300
This particle is NEUTRAL (has NO CHARGE) and is found INSIDE the nucleus.
What is a neutron?
300
This is the result when an object has EQUAL numbers of positive and negative charges.
What is: the object is NEUTRAL and has no overall charge?
300
This point has the WEAKEST electric field.
What is point A?
300
Wood and rubber are these types of materials.
What are insulators?
300
These were two challenges that older touch screens faced.
What is: they were not accurate and often could only process touch in one location.
400
This type of particle is transferred when socks are rubbed across the carpet. (They are transferred from the carpet to the socks.)
What are electrons?
400
This force pushes charged objects APART.
What is a repulsive force?
400
This happens when a POSITIVELY charged test object is placed inside a POSITIVELY charged electric field.
What is: the test object will be repelled?
400
This type of circuit is required for an electric current to flow through.
What is a CLOSED circuit?
400
This is what charged wires create in touch screens.
What is an electric field?
500
This is why hair becomes positively charged after rubbing it with a balloon.
What is: hair loses electrons to the balloon, resulting in more positive charges?
500
This happens to the electric force as the distance INCREASES between two charged objects.
What is: the electric force DECREASES?
500
This type of charge has electric field lines pointing TOWARD it.
What is a negative charge?
500
This is the reason why electric charges do not always travel through a conductor.
Why is: conductors do not always have current in them.
500
This is how engineers tested prototypes to improve touchscreen accuracy.
What is: they changed one part of the prototype and kept it if the change was positive. (Then they applied this to it in their next prototype.)