P2.1 - Electricity and Magnetism Flashcards
There are two types of charge (e.g. a magnet has them), what are they?
Positive and negative.
What happens when two of the same charges meet?
They repel each other, if the charges are different then they attract.
Atoms are the building blocks of the universe. They can be split down into three different smaller particles.
What are they and what charge do they have?
Protons - they have a positive charge
Electrons - they have a negative charge
Neutrons - they have no charge
If an atom has the same amount of both electrons and protons the charge of the atom is neutral.
Can neutrons be transferred to different atoms?
No - only electrons can transfer.
I recommend to see page 122 in kerboodle, it give a much better explanation than what i’ve done.
https://www.kerboodle.com/api/courses/1262/interactives/33419.html
What is a current?
A current is how much charge there is flowing per second.
What is the unit of measurement for a current? What meter do you use to measure it?
A current is measured in AMPS. You use an AMMETER to measure current.
What is the push that pushes charges around a circuit called?
Potential difference.
What unit is potential difference measured in? What meter is used to measure it?
Potential difference is measured in VOLTS. You use a VOLTMETER to measure it.
A cell is a structure that is used to power something. What is a rating of a cell?
A rating for a cell is the potential difference measured by a voltmeter.
What is a rating of a bulb?
A rating for a bulb is how much the bulb is designed to work at. E.g. the rating for a bulb is 6V, it will not work at higher ammounts.
What are the two types of circuits?
One of them forms one loop while the other contains more than one loop or branch.
Series - one loop
Parallel - multiple loops/branches
Why are parallel circuits practical?
If one bulb breaks the others will stay lit because they are separate unlike series circuits. If a bulb breaks in a series circuit then all of the bulbs will go out because the circuit is broken. You can also turn off individual structures in the circuit.
Resistance tells you how easy of difficult it is for charges to pass through different components. What is it measured in?
It is measured in ohms, its symbol is Ω.
How do you calculate resistance?
resistance = potential difference / current
Ω = V / A
Magnets
https://www.kerboodle.com/api/courses/1262/interactives/33419.html
Do you know it well?
Too lazy to do the rest.
