Electricity Flashcards
What is Current?
current is the flow of electrons measured in amps.
What is potential difference?
potential difference (also called voltage) pushes the charge around a circuit and is measured in volts.
What is resistance?
Resistance is anything in a circuit that slows the flow measured in ohms
down.
What is a conducter?
Anything that can conduct eletricity
Materials that let electrons to flow freely from
each particle.
What is an electron?
An electron is a negatively charged particle.
What charges repel?
negative charges with negative charges repel.
positive charges with positive charges repel.
What charges attract?
positive charges and negative charges attract.
Equation that links current,potential difference and resistance.
Resistance=potential difference/current
How do you add brightness to a bulb,
By adding another cell
How does changing current affect the strength of the electromagnet
If the current increases that means more electrons
What is static eletricity?
Build up of electrical charge on a object
What do electrostatic forces do?
Cause objects so levitate
What is a series circuit?
Components are connected end to end in a loop.If one bulb breaks they all stop working.and the current is the same everywhere
What is a parallel circuit?
In a parallel circuit the components are connected to separate branches.
If one bulb stops working the other will remain lit.and the current is split between the branches.
What do batteries store?
Batteries store chemical energy.
What does the battery do?
The battery contains potential difference which tells us how much energy it provides to the components.
What are modelling circuits?
Scientists use modelling circuits to to help them explain difficult concepts.
What is magnetism?
A non-contact force
What are three magnetic materials?
Iron
Nickel
Cobbolt
What are insulators ?
Materials that conduct heat not electricity e.g wood.
How can magnetic field lines be shown?
Can be plotted by using a plotting compass.
How do you make an electromagnet?
Independent variable-number of coils of wire.
Dependant variable-number of paperclips picked up.
Control variable-current supplied to the circuit , core material width of wire, length of wire and potential difference for battery or power pack.
The strength of an electromagnet can be increased by wrapping the wire around a magnetic material such as iron.
when does it happen is static electricity?
Occurs when a material either loses or gains electrons.
