Electromagnetism, Motors, & Generators Review

Master electromagnetism, motors, and generators with this 8th-grade science review worksheet!

Matching Match the term to the correct statement. Electromagnetism The interaction between electricity and magnetism Electric motor a device that changes electrical energy into mechanical energy Galvanometer a device that uses an electromagnet to measure current Electromagnetic induction The process by which electric current is produced by a changing magnetic field Solenoid a coil of wire that produces a magnetic field when carrying an electric current Generator Uses electromagnetic induction to transform mechanical energy into electrical energy Transformer A device that increases or decreases voltage consisting of two separate coils of insulated wires wrapped around an iron core Fill-in-the-Blanks A(n) electric current in a wire is surrounded by a magnetic field.A(n) permanent magnet produces a magnetic field so a wire loop will rotate.A(n) armature has many loops of wire wound around an iron cylinder, which rotates as current flows through the wire.The direction of current switches, so poles of the magnet reverse through a commutator.The electromagnetic field is strengthened through the field coil.Both a positive and negative brush supply current to the commutator.The current source supplies current to the coil, so it can become a magnet. Sort the statements. If it is correct, place it under TRUE. If the statement is incorrect or not true, place it under FALSE. TRUE statements A magnetic field can be turned on or off. The strength of a magnetic field can be changed. The strength of the magnetic field can be increased with more turns in the coil. If you move the coils of the wire closer together, the magnetic field will increase. If you use a stronger ferromagnetic material, the strength of the magnetic field will increase. Electric current can be induced by motion. FALSE statements A magnetic field's direction cannot be reversed. Electromagnets are not useful because their properties cannot be controlled by the user. If you increase the current in the wire, you decrease the magnetic field. Electric current can be induced if the coil and magnet remain still. Match the person with the accomplisment. Hans Christian Oersted discovered that an electric current creates a magnetic field Michael Faraday discovered electric current can be induced by changing a magnetic field Thomas Edison opened a generating plant in New York City Nikola Tesla received patents for a system of distributing alternating current Electric current that is ALWAYS in one direction through a wire. AC DC BC AD Electric current that reverses the direction of regular pattern. AD BC AC DC A device the increases voltage is a(n) electric motor. step-up transformer. generator. step-down transformer. A device that decreases voltage is a(n) electric motor. step-up transformer. generator. step-down transformer. Label Label the diagrams below using: primary coil, secondary coil, step-up transformer, step-down transformer. Make sure to copy the labels EXACTLY. primary coil secondary coil step-up transformer primary coil secondary coil step-down transformer Which coil is connected to the voltage source? primary coil secondary coil third coil what coil?