6-5-3 Magnetism & Electricity
How is a generator useful?
It uses magnetic force to create electricity
What is the difference between a generator and a motor?
A generator converts mechanical energy into electrical energy and a motor converts electrical energy into mechanical energy.
In an electromagnet, each section of the wire coil functions as a small separate conductor. How does this work to provide electric power?
The small currents of individual sections are added together to form one large current.
What is electric current?
a flow of energy in the form of charged particles
Mechanical energy is changed into electrical energy by which device?
a generator
What is a device used to convert mechanical energy into electrical energy called?
a generator
Which device changes mechanical energy into electrical energy?
a generator
Which device changes the mechanical energy into electrical energy?
a generator
What is created when electric current flows through the wire coil in an electromagnet?
a magnetic field
Mechanical energy in an electric motor is produced by an electromagnet which is connected to.....
a source of electric current
What type of device is created when a wire carrying an electric current is wrapped around an iron core producting a magnetic field?
an elecrtomagnet
How are magnetism and electricty related?
an electric current can produce a magnetic field
A magnet spinning around a stationary coil of wire forms....
an electric current in the wire
What is a machine that converts electric energy into mechanical energy called?
an electric motor
What type of device contains an electromagnet that rotates between the poles of a magnet?
an electric motor
A strong magnet that can be turned on and off is called....
an electromagnet
How are magnets and electricity all alike?
both have positive and negative forces
How does an electromagnet work?
by using electricity to make a magnet
What does a generator produce?
electrical energy
Why does the motor of a vacuum cleaner stop working when you unplug the cord? It no longer has a source of.....
electrical energy
What kind of energy transformation happens in an electric motor?
electrical energy is changed into mechanical energy
What happens in a motor running as part of an electric circuit?
electrical energy is changed to mechanical energy
In an electric motor, the energy transformation is from....
electrical to mechanical
The purpose of a generator at a power plant is to produce....
electricity
A coil of wires generates a magnetic field when a current is passed through it. What is this device called?
electromagnet
During a blackout, a hospital would lose its regular source of electical power. It would require another source of power. Which device could the hospital use in case of such an emergency?
generator
What uses magnetism to create electrical energy?
generator
Which type of device, found in power plants creates energy for homes?
generators
What would increasing the number of coils do to the strength of an electromagnet?
increase the strength
What makes an electromagnet more useful than an ordinary magnet?
it can be turned on and off
When two magnets are pulled together or pushed apart without touching, what force causes this response?
magnetic field
The purpose of an electic motor is to...
produce mechanical energy
When opposite poles of two magnets are close together....
they attract each other
When like poles of two magnets are close together.....
they repel each other
What is the role of a turbine in a power plant?
to convert mechanical energy into electrical energy
What is the purpose of the iron core in an electromagnet?
to make the magnetic field stronger