Investigation Test Review Sheet
Here is a condensed version of all the previous investigation reviews:
Electromagnets:
Ø You can increase the strength of an electromagnet by
o increasing the number of winds on the rivet (core)
o using tighter coiled wire around the rivet
o winding the coiled wire in one direction around the rivet
o adding another d-cell in a series circuit; adding another d-cell in parallel does not strengthen the electromagnet
o Using a thicker wire around the rivet
Ø In order to build an electromagnet, you need the following components:
o steel rivet (core)
o wires
o d-cell
o circuit base
o switch (for easy on and off)
Insulators/Conductors:
Ø Insulators are materials that DO NOT allow the flow of electricity in a circuit. They include: plastics, glass, foam, paper, rubber, wood, and other non-metals
Ø All conductors are made of metal. Conductors allow electricity to flow throughout the circuit. They include: wires, paperclips, nails, Fahnstock clips, and other metals.
Series/Parallel Circuits:
Ø Series circuits have ONE pathway or flow of electricity in a complete circuit. They are connected in a circular shape.
Ø Parallel circuits have TWO or MORE pathways of electricity flowing in a complete circuit. The energy is SHARED between components and they are connected in the shape of an 8.
Magnets:
Ø They stick (attract) to objects that contain iron or steel.
Ø When two magnets come in contact (come toward each other), they either attract (pull) or repel (push).
Ø When like poles (+,+ or -,-) come in contact they repel.
Ø When opposite poles (+,- or -,+) come in contact they attract.
Ø When you touch a piece of iron to a permanent magnet, magnetism is induced in the piece of iron, and it becomes a temporary magnet.
Ø The force of magnetism is stopped by thick objects because distance weakens the magnetic force between a magnet and another object or another magnet.