3 insulators
Rubber, glass, oil
3 conductors
Silver, gold, copper
Write Benjamin Franklin's 3 laws of static electricity
Bodies charged with static electricity attract uncharged bodies.
Like electric charges repel one another.
Unlike electric charges attract one another.
State the law of conservation of charge
electric charge can neither be created nor destroyed
List the three ways an object can acquire a static electrical charge
frictition, direct contact, induction
Briefly explain the light and dark bands in Thomas Young's experiment
The light bands resulted where light waves arrived in phase and strengthened one another: the dark bands resulted where light waves arrived out of phase and canceled one another.
State Coulomb's law
The force acting between two charges is inversely proportional to the square of the distance between them.
Describe an electric field
region of force that surrounds a charged object.
Define capacitance
Ability of a device to hold a charge.
What was the first useful purpose found for electricity?
the thelegraph
What type of surface radiates and absorbs heat most efficiency?
black dirt
What are light waves?
regular and rapid transverse vibrations of electric and magnetic fields that spread out evenly in all directions.