Electricity

In a series circuit, what will happen if the path for the electrical current is broken by a burned out bulb?

• The electrical current will stop fllowing and none of the bulbs will light up.

• The electrical current will continue flowing and the other bulbs will light up.

• The energy source will continue to move the electric charge through the circuit.

An electric tooth brush is an example of transforming

• electricity into heat

• electricity into sound energy

• electricity into motion energy

• electricity into light

In this image of a smoke detector what part of the circuit is the energy source?

• the battery

• the wire

• the alarm horn

• the test button

• the plastic case that covers the smoke detector when it is closed

Which of the following can transform electrical energy into heat?

• a hair dryer

• a warm sweater

• a barbeque grill

• the sun

Which of the following is a good conductor?

• copper

• rubber

• dry wood

• glass

Which type of circuit has more than one path for the electrical current?

• The series circuit

• The parallel circuit

• They both have more than one path

• Neither circuit has more than one path for the electrical current

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.

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.