I
What causes static electricity?
Imbalance of charge
Which of the following is an insulator?
iron, copper, aluminum, plastic
Plastic
Which device converts mechanical energy into electrical energy?
a generator
Of these, which is a semiconductor?
rubber, glass, wood, silicon
silicon
What is something a complete circuit must include?
a conducting path
a conductor
What does resistance affect?
How much electricity flows
Which device converts electrical energy into mechanical energy?
motor
through fields
Current flow from high to low ____________
potential
What is voltage?
potential difference
What does a magnetic field cause objects to do?
attract or repel
what does voltage provide?
It provides the energy needed to move electrons
When does an electromagnet lose magnetism?
when current stops
Which technology uses electromagnetism?
thermometer, fridge motor, ruler, or chair
fridge motor
Electrons flow only when there is what?
a complete circuit
What creates a magnetic field?
moving electrical charges
What is a material that does NOT allow electricity to flow easily?
insulator
What can changing magnetic fields produce?
electric current
opposition to current
Current is the flow of what?
electrons
Why do electromagnets differ from permanent magnets?
Electromagnets differ from permanent magnets because EM's need electric current
Static electricity often occurs due to what?
friction
Where does most electrical energy we use come from?
generators
Which is an everyday use of a motor?
dam generator, power plant turbine, washing machine, battery
washing machine