Circuites And Magnetism Flashcards
What is it called when areas where atoms’ magnetic fields line all faces up
Domain
What is the potential difference
The difference across a cell that tells you about the size of the force on the charges.
The potential difference also tells you how much energy can be transferred to components in a circuit by charges
How you find resistance, potential difference and ams
Pd divided by ams or ohms
Ams x ohms
Parts of a circuit
Ammeter, cell, bulb, switch and voltage meter.
What materials category can’t contain electricity
Insulators
What have positive charges
Protons
What has negative charges
Electrons
What is a neutron
It has no charge
What happens if atoms have an equal amount of protons and electrons
It has no charge and is netral
What is a current?
It is the amount of charge flowing through a circuit per second (ams)
What does a cell or battery do
It pushes the charges around the circuit
What is potential difference measured in
Volts from voltmeters
Resistance is measured in?
Ohms
What are good conductors
Metal as has low resistance and has a lot of electrons that are free to move.
Types of Insulators
Air and plastic as it doesn’t have many electrons that are free to move and create resistance.
What is a good magnetic material
Iron nickel cobalt lodestone
What is a magnetic field
It is a force on a magnet
What do domains do
The always face one direction in a magnet
Atoms in turn are made of three types of smaller particles called
Protons
Electrons
Neutrons
What happens when you rub a ballon on a jumper
The ballon will have negative charge and the jumper will have positive charge so they react
Current
Amount of charge that flows per second
What are the particles that move in metals
Electrons
Measuring potential difference in a cell
by connecting voltmeters across
How much charge is in an atom
It is neutral
I can distinguish static and current electricity.
Static electricity is an imbalance of electric charges within or on the surface of a insulator. The most significant difference between the static and current electricity is that in static electricity the charges are at rest and they are accumulating on the surface of the insulator. Whereas in current electricity the electrons are moving inside the conductor.
The cell or battery does what
Pushes around the circuit
I can compare a gravitational field and an electric field.
In an electric field there is a force on the charge. A gravitational field is the force field that exists in the space around every mass or group of masses. Electric force is much stronger than gravitational force. Gravitational force acts on mass while electric force acts on charge.
What does a resistor do and effect
So a resistor is used to limit the current. When a current flows through a resistor energy is wasted and the resistor heats up. The greater the resistance the hotter it gets. The battery has to do work to force the electrons through the resistor and this work ends up as heat energy in the resistor.
How does a compass work
The Earth is a magnet that can interact with other magnets in this way, so the north end of a compass magnet is drawn to align with the Earth’s magnetic field. Because the Earth’s magnetic North Pole attracts the “north” ends of other magnets, it is technically the “South Pole” of our planet’s magnetic field.
