Electricity and magnetism Flashcards
What happens when a positive charge is with a positive charge?
They repel.
What happens when a positive charge is with a negative charge?
They attract.
What are the three parts to an atom and what are their charges?
1) proton (+1)
2) electron (-1)
3) neutron (0)
Overall what is the charge of an atom?
Neutral.
What is current?
The flow of electrical charge (electrons) around a complete circuit per a second.
What is current measured in and what with?
Measured amps using an ammeters.
What is a cell?
A chemical store of energy, which provide the push that moves charge around a circuit.
What is a battery?
Two or more electrical cells joined together.
What are motors?
A component or machine that spins when a current flows through it.
What is potential difference?
A measure of the push of a cell or battery / the energy the cell or battery can supply.
What two things can potential difference tell you?
1) The potential difference across a cell tells you about the size of the force on the charges.
2) How much energy can be transferred to the components in the circuit by the charges.
What is used to measure potential difference and what is the measurement?
A voltmeter measures potential difference and it is measured in volts.
What is rating?
The value of potential difference at which a cell or bulb operates.
What are the 2 types of circuit?
Parallel and series.
What are the differences between the 2 types of circuit?
In series, all the components are in one big loop but in parallel the components are in a separate loop. This means that in series circuits if one component breaks none of the circuit will work as the current can not flow.
