Key concepts
How is a electric current related to a magnetic field?
An electric current produces a magnetic field
What does a electric motor do?
An electric motor transforms electrical energy into mechanical energy.
What is electromagnetism?
This relationship between electricity and magnetism is called electromagnetism.
What is mechanical energy?
The energy an object has due to its movement or position is called mechanical energy.
What is alternating current or AC?
The induced current in a wire that would reverse direction repeatedly is called alternating current.
What are some characteristics of a magnetic field produced by a current?
The magnetic field produced by a current has three distinct characteristics. The field can be turned on and off, have its polarity reversed, and have its strength changed.
How can a electric current be produced in a conductor?
An electric current is induced in a conductor when a conductor moves through a magnetic field.
What is a solenoid?
A coil of wire with a current is called a solenoid
What is a galvanometer?
A galvanometer is a device that measures small currents
What is a transformer?
A transformer consists of two separate coils of isolated wire around an iron core.
what are the characteristics of a electromagnet?
An electromagnet is a strong magnet that can be turned on and off.
A generator uses motion in a magnetic field to produce an electric current.
What is a electromagnet?
A solenoid with a ferromagnetic core is called an electromagnet.
What is a electric motor?
An electric motor is a device that uses electrical energy to turn an axle.
What is a electric generator?
An electric generator is a device that converts mechanical energy into electrical energy.
How can electrical energy be transformed into mechanical energy?
When a wire with a current is placed in a magnetic field, electrical energy is transformed into mechanical energy.
What is the function of a transformer?
A transformer is a device that increases or decreases voltage.
What is energy?
The ability to move an object over a distance is called energy.
What is electromagnetic induction?
Generating electric current from the motion of a conductor through a magnetic field is called electromagnetic induction.
What is a step up transformer?
A transformer that increases the voltage is called a step up transformer.
How does a galvanometer work?
An electric current is used to turn the pointer of a galvanometer.
What is electrical energy?
The energy associated with electric currents is called electrical energy
What is Direct Current or DC?
A current consisting of charges flowing in only 1 direction is called direct current.
What is a step down transformer?
A transformer that decreases voltage is called a step down transformer.