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Electromagnetism

Chapters 17 and 18

QuestionAnswer
What is the region around a charged object where an electric force is present? electric field
What happens when electrons move from one object to another by direct contact? conduction
What device would you use to see if something is charged? electroscope
If a material does not allow charges to move through it easily, what is it called? electrical insulator
What is the loss of static electricity as charges move off an object? static
Which does the size of a current depend upon? voltage
What do you call materials with a resistance of 0 Ω? superconductors
As resistance increases (goes up), what happens to the current current decreases
What is the rate at which electrical energy is changed into other forms of energy electric power
What is the voltage if the current is 4 A and the resistance is 10 Ω? 40V
In the formula P = V × I, what does the I stand for? current
Circuits need three basic parts, an energy source, wires, and what else? load
How many pathways are there for moving charges in a series circuit? one
In a short circuit, as the resistance decreases, what happens to the current? increases
Why are protons and electrons attracted to each other? because protons have a positive charge and electrons have a negative charge
What method is involved when charges in an uncharged metal object are rearranged without direct contact with a charged object? induction
Which of the following is a conductor? copper
What generates electrical energy from chemical energy? cell
What is a switch that automatically opens if the current is too high? circuit breaker
What does the amount of energy released per charge depend upon? voltage
In a photocell, what gains energy to move between atoms? electrons
What is the rate at which charges pass a given point? electric current
As voltage increases (goes up), what happens to current? current increases/goes up
Where does most of the electrical energy used in your home come from? electric power plants
Light bulbs may be labeled “100 W” or “40 W." describes brightness
Good conductors have low resistance
Two poles, magnetic forces, and magnetic fields are the magnets’ properties
Which of the following are two kinds of magnets? ferromagnets, electromagnets
Which of the following are two effects of Earth’s magnetic field? compass points to magnetic North, auroras seen at both poles
What does an electric current produce? magnetic field
What uses an electromagnet to measure electric current? galvanometer
Electric current that changes direction is called alternating current
Whether a material is magnetic or not depends on which of the following material's atoms
What is created when a magnet moves through a coil of wire? electric current
What can demagnetize a magnet? high temps
A coil of wire that has a soft iron core and that acts as a magnet when an electric current is in the coil is called a(n) electromagnet
What did Faraday’s experiments with magnets and electromagnetic induction demonstrate? Magnetic fields are made when the electric field changes.
What can you make visible by sprinkling iron filings around a magnet? magnetic field lines
what is not true about an electromagnet? Its strength is reduced by adding more loops per meter.
When domains of atoms line up, what do they create? magnetic field
Where are the strongest magnetic effects on magnets? both poles
In which of the following devices can two solenoids and an iron plunger be used to apply the principle of electromagnetics? doorbell
In which of the following devices is an armature mounted between magnetic poles and attached to a commutator to reverse the direction of the electric current? electric motorr
Increasing the electric current in the wire is one way to strengthen solenoid's magnetic field
a material in which charges can move freely electrical conductor
a material in which charges cannot move freely electrical insulator
the ratio of voltage to current is a constant for each material ohm's law
a device used to open and close a circuit switch
Created by: jlindsay_science
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