Electricity
What is the flow of charged particles?
Electric Current
What is area around the magnet that can attract or repel metal?
Magnetic field
What can coils of electric current cause?
Magnetic field
What gives energy(push) to charged particles in a circuit?
Battery
What makes a good conductor? Give an example.
A material that allows free charged particles to move easily from one atom to another.
Copper, gold
What is the push or pull when a north pole and a south pole of a magnet are near each other?
Magnetic force
In what ways is the electromagnetic like a magnet? Different?
It has a magnetic force that attracts and repels.
It uses electric current to magnetize itself. It can be turned on and off, unlike a magnet.
What is resistance?
Opposition to the flow of current?
What are 2 indicators of electrical energy?
Light
Heat
How does the distance between magnets affect how they interact with each other?
When the magnets get closer to each other, they have a much stronger force.
What angle does magnetism and electricity exist together?
Right angle, perpendicular
Which type of circuit will have less current as you add bulbs? What happens to resistance as you add bulbs?
Series
It goes up.
What is the relationship between an electric current and an electric circuit?
If there is electric current, then the circuit is closed.
Why is Earth magnetic?
The flowing of liquid metal in the core of the planet generates electric currents. The rotation of the Earth causes these currents to form a magnetic field around the planet.
What is the role of a magnetic force in a galvanometer?
Magnetic force from the wires repels the needle of the compass.
Why are bulbs brighter in a parallel circuit?
As bulbs are added in parallel, resistance decreases. The voltage is the same across each bulb and current increases.
If a series circuit uses a 50 V battery and has 2.5 amps of current, what is the total resistance?
Write the equation you used and solve. Use units for resistance.
R = V/I
R = 50/2.5
R=20 ohms
How is a magnet the same as electric charge? How is it different?
Opposite poles attract as opposite charges attract. Like poles repel as like charges repel.
Magnetic poles are permanent. Electric current can be turned on and off and therefore the magnetic field can be turned off.
What are the factors that affect the strength of an electromagnet?
-Number of wraps of wire around the nail.
-Voltage/current of the battery
What is the relationship between voltage, current and resistance?
Write 3 equations
V=I x R
I=V/R
R=V/I