Magnetism with Some Electricity and Circuits.

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

What two forces are required for generators and electric motors to work? 

• magnetism and thermal 
• electricity and thermal 
• electricity and magnetism 
• magnetism and radiant 

In the series circuit shown below, what would happen if one of the light bulbs and its attached wire segment were removed?

• The remaining lights would go out.

• The remaining lights would shine with the same brightness.

• The remaining lights would shine less brightly.

• The remaining lights would get brighter.

In the parallel circuit shown below, what would happen if one of the light bulbs and its attached wire segment were removed?

• The remaining lights would go out.

• The remaining lights would shine with the same brightness.

• The remaining lights would shine less brightly.

• The remaining lights would get brighter.

How is an electromagnet different from a bar magnet?

• Only the bar magnet has a magnetic field.

• Only an electromagnet attracts materials made of iron.

• A bar magnet is temporary and is only magnetic when a current flows through a wire wrapped around the core.

• An electromagnet is temporary and is magnetic when a current flows through a wire wrapped around the core.

Which of the following statements is true about magnets?

• The north pole of one magnet is attracted to the north pole of the

  other magnet.

• The south pole of one magnet is attracted to the north pole of the other magnet

• The south pole of one magnet is attracted to the south pole of the other magnet

• The south pole of one magnet is attracted to both poles of the other magnet

What unit is used to measure current?

• Ohms

• Omega

• Volts

• Amps

What is the resistance of a lightbulb that experiences 9 Volts and 3 amps of current?

• 1/3 ohms

• 3 ohms

• 27 ohms

• 9 ohms

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

• 1 Ohm
• 3 Ohms
• 4 Ohms
• 12 Ohms

The mathematical relationship among Voltage, Current, and Resistance

• Faraday's Law
• Tesla's Law
• Edison's Law
• Ohm's Law