2nd Review Magnetism and Electricity

A balloon is rubbed all over with wool.  The balloon will now attract wool because the balloon and wool

• are magnets
• have opposite charges
• have like charges
• have neutral charges

In a static discharge, which particles move from one object to another?

• protons
• neutrons
• electrons
• atoms

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Which of the following could be used as the core of a simple electromagnet?

• drinking straw
• iron nail 
• a soda bottle
• an ink pen

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What is voltage?

• a measure of electric current
• a kind of static elecricity
• a kind of current electricity
• a measure of potential energy difference

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Which of these in an insulator?

• a copper wire
• a silver spoon
• a plastic coating on a wire
• an aluminum coating on a wire

What is the purpose of a switch in an electric circuit?

• to allow the circuit to be opened or closed
• to change the direction of the current
• to provide a push for the current
• to increase the electric power to the load

What is the purpose of an electric motor?

• to convert electrical energy to mechanical energy
• to convert chemical energy to electrical energy
• to convert mechanical energy to electrical energy
• to convert mechanical energy to heat energy

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Electric current flowing through a wire produces

• static electricity
• an open circuit
• a permanent magnet
• a magnetic field

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What is the purpose of an iron core in an electromagnet?

• to hold the loops of wire in place
• to make the magnetic force stronger
• to change the direction of the electric current
• to change the direction of the magnetic force

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Each time a lightbulb is added to a series circuit, the other bulbs in the circuit 

• get brighter
• get dimmer
• stay the same brightness
• release more heat