Current Electricity

How does alternating current differ from direct current?

• Alternating current produces more voltage than direct current

• Alternating current always flows in the same direction; the direction of a direct current switches back and forth

• Direct current produces more voltage than alternating current

• Direct current always flows in the same direction; the direction of an alternating current switches back and forth

What do fuel cells, batteries, and solar cells have in common?

• They all produce static electricity

• They are all sources of direct current

• They are all sources of alternating current

• They can all be used to power automobiles

Tags

NGSS.HS-PS3-3

How does electricity travel from power plants to your house?

• It travels through the air as electromagnetic waves

• Through a series of generators

• Through a series of many transformers

• Through transmission wires

How does a generator create current?

• By using an electromagnet

• By using an internal combustion engine

• By using a fan

• By using energy from the sun

Place the following events in sequence: Voltage is increased by a transformer; Voltage is decreased by a transformer; Electrical current enters your home

• A, B, C

• B, A, C

• A, C, B

• B, C, A

What is an electric current?

• a build up of electrons

• the difference in charge between 2 points

• the flow of electrons across a circuit

• opposition to the flow of electrons

What is the unit we use to measure electric current?

• ampere (amp)

• ohm

• volt

• newton

If the voltage is increased and the resistance stays the same, current will ____.

• Increase

• Decrease

• Stay the same

• Not enough info

The light bulb does not turn on, which statement explains why it is not working?

• The battery is dead

• The light bulb is broken

• The bell is taking all of the energy

• The light bulb is not part of a complete circuit

Tags

NGSS.MS-ETS1-1

Mrs. Rodriguez has a battery, wooden spoon, copper wire, metal paperclip, and a light bulb. Which materials does Mrs. Rodriguez need in order to create a complete circuit?

• battery, wooden spoon, copper wire, and light bulb

• battery, metal paperclip, copper wire, and light bulb

• metal paperclip, copper wire, and light bulb

• battery, wooden spoon, and light bulb

Tags

NGSS.4-PS3-2