Electricity

A circuit made of wires, a lamp, a switch, and a cell is shown at the right. What change is needed for the lamp to glow? 

• The switch needs to be opened.
• The switch needs to be closed.
• The cell needs an insulator.
• The wire needs to be connected to the bottom of the cell.

Which statement best explains why the lamp does not glow? 

• Circuit 1 is an open circuit.
•  Circuit 1 is a closed circuit.
•  The negative terminal of Circuit 1 is connected to the cell.
• The positive terminal of Circuit 1 is connected to the cell.

Which property of wood makes it a good material for the handle on a cooking tool? 

• Wood is a natural material. 
• Wood is unaffected by metal. 
• Wood conducts heat well. 
• Wood does not conduct electricity well.

Mary-Alice likes to bring her coffee to work each morning.  However, she wonders what the best cup to bring would be if she wants her coffee to stay warm.  Which of the following materials would keep Mary-Alice’s coffee warm the longest? 

• paper
• Styrofoam
•  plastic
•  glass

Which material is the best conductor of heat? 

• aluminum 
• glass
• wood
• plastic

Which of the following items could not be used to create a closed circuit? 

• battery, light bulb 
• battery, wires, buzzer
• battery, light bulb, wires 
• battery, light bulb, buzzer, wire

The wires connecting the battery and the light bulb create a closed circuit. What would happen if one of the wires were cut?

• The light would go out. 
• The light bulb would crack. 
• The wire would become hot. 
• The battery would lose its crack.

What roofing material would conduct the least amount of heat? 

• copper 
• aluminum 
•  cedar wood 
• steel

Why is an insulator used in a circuit? 

• An insulator helps keep the electric charges inside the pathway.  
•  An insulator transforms electrical energy into other forms of energy.      
•    An insulator provides the pathway electric current moves through.
•  An insulator provides the energy to pump electric charges through the circuit. 
   

Which statement best describes the circuit in the diagram?

• It is a series circuit.
• It is a parallel circuit.
• There are 2 paths.
• The circuit is opened.