Electricity and Heat

During planning for an investigation, Marion draws three ways she could connect a battery, a paper clip, a light bulb, and some wire. Which arrangement would light the bulb?

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Explain why in this case the light bulb will not get lit.

What is the purpose of a SWITCH in a simple circuit?

• To use the electric current

• To connect the components

• To provide a source of electrical energy.

• To change the circuit from open to close and viceversa.

Can a doorbell work if it's not attached to a source of energy?

• Yes, always.

• It depends upon the type of bell it has.

• No. It needs a source of energy to make it work.

A doorbell circuit includes a source of current, a bell that rings, a button that switches the current on and off, and wires that carry the current. 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.

Heat energy can move between substances. Which condition must be present for the transfer of energy to take place?

• The object must always be gases or liquids.

• The objects must be the same temperature.

• The objects must both be solids.

• The objects must have different temperatures.

Explain the reason behind your choice on question number 6.

On a warm sunny day the metal on your car becomes scalding hot. Which statement BEST explains the fact.

• Heat from the sun warms the car through convection.

• Heat from the sun warms the car through friction.

• Heat from the sun warms the car through conduction.

• Heat from the sun warms the car through radiation.

Marvin needs to choose an item to use as the conductor in a circuit he is making. Which of the following items would be his BEST choice for a conductor of electricity?

• Metal straw.

• Glass bead.

• Plastic straw.

• Wooden straw.

Aileen is making a list of reasons the bulb in her circuit does not light. Which of the following COULD BE on her list?

• The switch is open.

• The wires do not make a complete loop.

• Th light bulb is tight.

• The battery is charged.