Energy Transformation and Circuits

What energy transformation occurs when the doorbell rings?

• electrical energy into light energy

• electrical energy into sound energy

• chemical energy into light energy

• mechanical energy into electrical energy

What other item does Sara need to make a complete circuit.

• a battery

• a switch

• an insulator

• a conductor

Philip needs to choose an item to use to complete a circuit he is making. Which of the following items would be his BEST choice?

• metal coin

• glass bead

• plastic straw

• wooden toothpick

What energy transformation is happening when you use an electric oven to cook food?

• thermal energy --> light energy

• electrical energy --> thermal energy

• thermal energy --> electrical energy

• electrical energy --> motion energy

What is the difference between a series circuit and a parallel?

• A series circuit has only one path for current to follow, and a parallel circuit has more than two paths.

• A series circuit uses a battery power source and a parallel circuits uses a wall outlet.

• A series circuit only has current flowing one direction, and a parallel circuit has current flowing in two directions.

• A series circuit only powers one or two things, and a parallel circuits powers many devices.

A circuit diagram uses symbols to represent each part of the circuit. Look at the circuit diagram and the key shown here.

What is the purpose of the wire in the circuit?

• to use the electric current

• to connect the components

• to provide a source of electrical energy

• to change the circuit from open to closed

Which of the following will cause electric charges to no longer flow through a circuit?

• A wire is replaced with a conductor.

• A switch is flipped, causing the circuit to become closed.

• The circuit is changed so that the wires do not make a complete loop.

• The wires are changed so that a series circuit becomes a parallel circuit.

If no changes are made to this circuit, what will the results be?

• Both bulbs are off because the switch is open

• Only the left bulb is lit because it has a closed path. The right bulb is not lit because of the open switch

• Both bulbs are lit because they each have a complete, closed path to the battery

• Only the right bulb is lit because an open switch causes the energy to flow to the bulb.

What would the result be if wires 2 & 6 were removed?

• All of the bulbs would light because wire 3 can replace wire 2.

• All of the bulbs would light because the battery has a full charge

• None of the bulbs would light because wire 6 is necessary

• None of the bulbs would light because there is no switch

Why is electrical wiring usually made from copper?

• Because copper is shiny

• Because copper conducts electricity

• Because copper is not magnetic

• Because copper insulates electricity

Tags

NGSS.MS-ETS1-1