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Investigation Test Review Sheet Here is a condensed version of all the previous investigation reviews: Electromagnets: 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 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: 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 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: Series circuits have ONE pathway or flow of electricity in a complete circuit. They are connected in a circular shape. 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: They stick (attract) to objects that contain iron or steel. When two magnets come in contact (come toward each other), they either attract (pull) or repel (push). When like poles (+,+ or -,-) come in contact they repel. When opposite poles (+,- or -,+) come in contact they attract. 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. The force of magnetism is stopped by thick objects because distance weakens the magnetic force between a magnet and another object or another magnet.