Electric Force
What charges do protons, neutrons and electrons have?
Protons are positive, electrons are negative and neutrons are neutral.
What poles of a magnet attract and which poles repel?
Two similar poles will repel each other while two opposite poles will attract one another.
When a current flows through a wire what is produced.
Magnetic fields
A device that changes the voltage of electric current is known as________
A transformer.
A transformer that increases the voltage is known as this?
A step up transformer
What is an electric field?
The invisible region around charged particles where the electric force is exerted one other charged particles.
What is a magnet field? Where is the field the strongest?
A magnetic field is a region where magnets or magnetic materials experience a non-contact force, and it's strongest at the poles of a magnet.
To construct an electromagnet you need an iron core, a battery, and ________.
A transformer that decreases the voltage is known as what?
A step down transformer.
Electric doorbells found in many homes require 10 V to operate. A transformer is used to convert standard household 120 V to the 10 V required by the doorbell. Is this a step up or step down transformer? How do you know?
Step down. Because it decreases the voltage.
How would you draw the field lines around a positively charged object? How would you draw the field lines around a negatively charged object?
Field lines go away from the positive and toward the negative.
If you break a magnet what will happen to the poles?
When you break a magnet, each resulting piece becomes a separate magnet with its own north and south poles.
What is a device that uses an electromagnet to convert electrical energy into mechanical energy called?
a motor
What is the difference between a solenoid and a electromagnet?
While both use coils of wire to generate magnetic fields, the main difference is that an electromagnet typically includes a ferromagnetic core (usually iron) to intensify its magnetic field.
What is the purpose of a transformer?
To increase or decrease voltage.
What is the difference between current and static electricity?
Static electricity involves a build-up of charge that is not flowing, while current electricity involves a continuous flow of charge.
What is the Earth's magnetic field? Where is it the strongest?
The Earth's magnetic field is a natural magnetic field that surrounds the planet, generated by electric currents in the Earth's molten outer core. It's strongest near the poles, where the magnetic field lines converge.
A device that changes mechanical energy into electrical energy via electromagnetic induction is called what?
A generator.
If the input coil has more coils than the output coil in an electrical transformer, what would happen to the resulting voltage? What is that called?
It would be less. This is called a step-down transformer.
How are motors and generators the same and how are they different.
Motors and generators both have a permanent magnet and an electromagnet. Motors change electrical energy to mechanical energy while generators do the opposite.
Why are some objects conductors of electricity and some insulators?
Conductors have loosely bound electrons that can move easily, while insulators have tightly bound electrons that resist movement.
How does Earth's magnetic field protect us?
Earth's magnetic field protects us by deflecting harmful solar radiation and cosmic rays, preventing them from reaching the Earth's surface and atmosphere.
What are three ways to increase the strength of an electromagnet?
Increasing the number of turns in the coil, using a larger iron core, or increasing the amount of current
What is electromagnetic induction?
The process of generating electric current with a changing (rotating) magnetic field.
Calculate the output voltage of a transformer with 2500 coils on the secondary side and 25 coils on the primary side if the input voltage is 500 volts
500,000 v