Electromagnetic Induction and Magnetism
Terms in this set (60)
Doing this to a wire will intensify it's magnetic field.
Bending a current carrying wire.
How are generators in relation to motors?
A generator works in the backward function of a motor.
What can result in moving magnets?
The shifting of a magnetic field can create current if done so near a wire.
What is a way to weaken a magnet?
Magnets are weakend by breaking or heating them. This makes their domains unaligned.
How are magnetic poles and electric charges different?
Charges can be isolated where as poles cannot be.
What is a key element in making a motor functional?
What does a transformer actually transform?
What does a galvanometer measure?
What does the Earth's magnetic field do to cosmic rays?
It deflects them.
What kind of field will surround a stationary charge, a moving charge?
An electrical field; both an electric and magnetic field.
How magnets and currents relate?
They can create each other.
When is deflection least on particles? Greatest?
Generators convert what type of energy?
Mechanical energy into electrical energy.
What is the formula for power?
What is the SI unit for current?
Megnetism and electricity are...
Magnetism is produced by?
the motion of electrical charges
Electric current can be produced by?
motion of a magnet
When a magnet is plunged in and out of a coil of wire and the rate of in the in-and-out motion of the magnet is doubled, the induced voltage...
When a magnet is plunged in and out of a coil of wire, and the number of loops in the coil is doubled, the induced voltage...
A rapidly changing magnetic field in any region of space induces a rapidly changing?
A generator uses electromagnetic induction to convert mechanical energy to?
What uses electromagnetic induction to induce a voltage in the secondary that is different from that in the primary coil?
What type of waves are composed of vibrating electric and magentic fields that regenerate each other?
What is the speed of all electromagnetic waves?
They are all the same; they are all the speed of light.
Attraction or repulsion of magnets depend on their north and south magentic...?
Opposite poles attract; like poles...?
What are clusters of magnetically aligned atoms?
What surrounds a current carrying wire?
A magnetic field
A charged particle moving in a magentic field experiences a deflecting force that is maximum when the charge moves in what direction to the field?
What is a simple instrument designed to detect electric current?
What instrument measures current?
What instrument measures voltage?
What is the largest sized magnetic in the world?
How is a magnetic field produced?
The motion of electric charge (electric current).
True or false: There exists a magnetic field if the electron pairs within atoms of a substance spin in opposite directions
When is the deflection of moving charged particles by a magnetic field greatest?
When the particles are moving perpendicular to the magnetic field.
When is the deflection of moving particles by a magnetic field zero?
When the particles are moving parallel to the magnetic field.
How do the concepts of force, field, and current relate to a galvanometer?
Galvanometers are based on the effect that the force is maximum when the current is perpendicular to the field.
What will happen if you move a magnet into a coil with more loops?
More voltage will be induced.
How can you create an electromagnet?
By placing a piece of iron into a current-carrying coil.
What is electromagnetic induction?
Inducing of voltage by changing the magnetic field near a conductor.
According to ___(1)____ law, the induced voltage in a coil is _____(2)______ to the product of the number of ____(3)___ and the rate at which the _____(4)_____ field within the loops changes.
What are electromagnetic waves composed of?
Vibrating electric and magnetic fields that regenerate each other.
Complete the statement: A generator uses electromagnetic induction to convert
mechanical energy to electric energy.
When moving from a primary coil to a secondary coil, current and voltage have an __________ relationship.
In terms of one coil, current and voltage are ________ proportional in Ohm's Law.
Why does a transformer require alternating voltage?
An alternating current allows the flow of charge to move back and forth, creating a magnetic field which in turn allows you to step up/down voltage.
a current can be induced in a closed circuit without the use of a battery or an electrical power supply by moving the circuit through a
A loop of wire is held in a vertical position at the equator with the face of the loop facing in the east-west direction. What charnge will induce the greatest current in the loop?
rotating the loop so its faces is north-south
Eletricity may be generated by rotating a loop of wire beteen the
the plane of the loop is perpendicular to the magnetic field
According to Lenz's law, if the applied magnetic field changes
the induced field attempts to keep the total field strength constant
What can be used to generate electricity
move the circuit loop into and out of a magnetic field, change the magnetic field strength around the circuit loop, change the orientation of the circuit loop with respect to the magnetic field
according to Lenz's law, the magnetic field of an induced current in a conductor will
oppose a change in the applied magnetic field
Which conversion process is the basic function of the elctric generator?
mechanical energy to electrical energy
voltage drop from one end of a rod in a magnetic field to the other
power required to keep a rod still in a magnetic field
the work done moving a unit positive charge from infinity to that point.
the product of magnitude of field strength and the rate at which the area is changing
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