Electricity and magnetism

What is the purpose of a generator?

• to convert electrical energy to mechanical energy
• to convert chemical energy to electrical energy
• to convert mechanical energy to electrical energy
• to convert mechanical energy to heat energy

Tags

NGSS.HS-PS3-3

A student is investigating how changing the size of the core of an electromagnet affects its strength.  Which of these is most likely the dependent variable in the student's investigation?

• the number of wire coils wrapped around the core
• the number of paper clips picked up by the electromagnet
• the voltage of the battery used in the circuit
• the size of the piece of iron used as the core

How are fossil fuels used to generate electrical energy?

• Heat from burning fuel creates steam that spins a turbine.

• Heat from burning fuel spins magnets inside an electric motor.

• Heat from burning fuel causes an electric motor to produce a current.

• Heat from burning fuel creates steam that turns a transformer.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A temporary magnet that only works when electricity is passed through wires surrounding an iron core is called:

• electromagnet

• galvanometer

• induction

• super conductor magnet

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What two forces are required for generators and electric motors to work? 

• magnetism and thermal 
• electricity and thermal 
• electricity and magnetism 
• magnetism and radiant 

Tags

NGSS.MS-PS2-3

Generators are devices that convert _____ energy into _____ energy.

• chemical; mechanical
• mechanical; electrical
• electrical; mechanical
• potential; kinetic

Tags

NGSS.HS-PS3-3

What is the transfer of energy in when you plug in a motor and it spins?

• chemical to mechanical

• electrical to mechanical

• mechanical to electrical

• physical to potential

Tags

NGSS.MS-PS3-5

A device that protects a circuit by from having too much current is called a

• switch

• short

• fuse or breaker

• resistor

Voltage is

• the potential electrical energy or push that makes electrons flow

• causes a short circuit with electrical energy

• is the term used for rate of charge flow

• Wastes energy by allowing current to flow

A laptop is plugged into a 120 V outlet and uses 60 ohm's of resistance. How much current is running though it?

• 120 Amps

• 60 Amps

• 2 Amps

• 20 Amps