Electricity

Sally is creating a model to show what happens when electricity is used.  She decided to show the motor spinning below as her model. How could she best explain what is happening?

• Electric energy is transformed into energy of motion.
• Heat energy is transformed into energy of motion.
• Heat energy is transformed into electric energy.
• Electric energy is transformed into light energy.

A student was playing music on her new cell phone.    The teacher explained that the phone was powered by a battery. The teacher then asked her to explain what was happening to the energy in her new phone.   How could she best explain this to the class?

• Electric energy is transformed into sound energy.
• Light energy is transformed into sound energy.
• Sound energy is transformed into electric energy.
• Sound energy is transformed into electric energy.

A student wants to use the diagram below to explain what happens when the light bulb turns on. How could she best explain what is happening?

• Light energy is transformed to electric energy.
• Electric energy is transformed to light energy.
• Electric energy is transformed to motion energy.
• Motion energy is transformed to electric energy.

Will this circuit light the bulb? 

• Yes
• No

Will this circuit light the bulb? 

• Yes
• No

Will the light bulb light up if the switch remains open as shown?

• Yes, because the circuit will be complete.
• Yes, because the battery will push the electric current.
• No, because the electric circuit is not complete.
• No, because the battery will push the electric current.

The circuit  lights the light bulb. What is the purpose of the switch in the circuit?

• to push the electric current
• to open and close the circuit
• to insulate the circuit
• to make the electricity

The circuit below lit the light bulb. What is the best claim we can make from this evidence?

• The metal key is an insulator.
• The metal key is a conductor.
• The wires are not conductors.
• The circuit is not complete.

Jill finds that all of the electric cords in her school are covered in plastic. Why is it important to cover the electric cords with plastic?

• Plastic is an insulator.
• Plastic is a conductor.
• Plastic is strong.
• Plastic will melt.

Tasha tested several items to see if they could conduct electricity.  Her data is shown below. What is the best claim she could make from her data?

• Wood is an insulator.
• Metal is an insulator.
• Keys are insulators.
• Toothpicks are conductors.