Test 7 Flashcards
What is the rate of electric charge flow?
current
What is the region of concentrated magnetism at the end of a magnet?
pole
A balloon is rubbed with a wool cloth and sticks to a wall. Why can the balloon stick to the wall?
electric charge increases
The reciprocal of the total resistance of a _______ circuit equals the sum of the reciprocals of the resistance of the individual resistors.
parallel
What moves when charge flows through an electrolyte?
ions
Changing the charge of one object ___________ changes the attraction or repulsion between it and another object.
proportionately
What happens to resistance as the diameter of a conductor increases?
decreases
What is the orientation of the lines of flux when the inclination at the magnetic poles is 90 degrees?
vertical
What process imparts electric charge at a distance without direct contact between objects?
induction
In a parallel circuit, the voltage of each branch must be the ______ as the voltage of the circuit as a whole.
same
What is the Si unit of current?
ampere
What are used to indicate the direction and strength of a magnetic field?
lines of flux
What happens to the total current flowing in a parallel circuit when more branches are added?
increases
What value equals the product of voltage and current in an electric current?
power
What term describes a substance that has several unpaired electrons per atom and is strongly attracted to magnets?
ferromagnetic
What is the imaginary line that circles Earth halfway between the two magnetic poles?
magnetic equator
An electromagnet’s coil has 50 loops. What will happen to the strength of the electromagnet if another 50 loops are added?
quadruples
What circuit-protection device uses a narrow strip of metal to prevent excessive current through a circuit?
fuse
What is the most important factor affecting the ease of current flow through a wire?
material
What method of magnetism is used when a needle is magnetized by holding a magnet near the needle?
magnetizing by induction