Part A. Vocabulary Review Directions: Complete the following sentences using the terms listed below. magnetism magnetic poles magnetic domains turbine electromagnet repel commutator generator electromagnetic induction alternating current direct current galvanometer transformer electric motor __ 1. The regions on a magnet where the magnetic force is strongest are called __ . __ 2. The south pole of a magnet will __ the south pole of another magnet. __ 3. A device that uses an electromagnet to measure electric current is a(n) __ . __ 4. A device used to increase or decrease the voltage of current in a'power line is a(n) __ . __ 5. A switch that regularly reverses the current in some motors is a(n) __ __ 6. Current that flows in only one direction through a wire is called __ __ 7. A large wheel that rotates when pushed by water, wind, or steam. __ 8. When current in a circuit reverses its direction in a regular pattern, it is called __ . __ 9. The properties and interactions of magnets are referred to as __ . __ 10. Groups of aligned atoms in a magnet are called __ . __ 11. A(n) __ is formed by placing a piece of iron inside a current- carrying coil of wire __ 12. A machine that changes electrical energy to mechanical energy is a(n) __ used to do work such as turning a fan. __ 13. A device that produces an electric current by rotating a coil of wire in a magnetic field is a(n) __ __ 14. The process by which moving a wire through a magnetic field produces an electric current is

## Step 1<br />The first sentence is about the regions on a magnet where the magnetic force is strongest. These regions are known as magnetic poles.<br /><br />## Step 2<br />The second sentence is about the interaction between the south poles of two magnets. According to the basic principles of magnetism, like poles repel each other.<br /><br />## Step 3<br />The third sentence is about a device that uses an electromagnet to measure electric current. This device is known as a galvanometer.<br /><br />## Step 4<br />The fourth sentence is about a device used to increase or decrease the voltage of current in a power line. This device is known as a transformer.<br /><br />## Step 5<br />The fifth sentence is about a switch that regularly reverses the current in some motors. This switch is known as a commutator.<br /><br />## Step 6<br />The sixth sentence is about current that flows in only one direction through a wire. This type of current is known as direct current.<br /><br />## Step 7<br />The seventh sentence is about a large wheel that rotates when pushed by water, wind, or steam. This wheel is known as a turbine.<br /><br />## Step 8<br />The eighth sentence is about current in a circuit that reverses its direction in a regular pattern. This type of current is known as alternating current.<br /><br />## Step 9<br />The ninth sentence is about the properties and interactions of magnets. These are referred to as magnetism.<br /><br />## Step 10<br />The tenth sentence is about groups of aligned atoms in a magnet. These groups are known as magnetic domains.<br /><br />## Step 11<br />The eleventh sentence is about a device formed by placing a piece of iron inside a current-carrying coil of wire. This device is known as an electromagnet.<br /><br />## Step 12<br />The twelfth sentence is about a machine that changes electrical energy to mechanical energy. This machine is known as an electric motor.<br /><br />## Step 13<br />The thirteenth sentence is about a device that produces an electric current by rotating a coil of wire in a magnetic field. This device is known as a generator.<br /><br />## Step 14<br />The fourteenth sentence is about the process by which moving a wire through a magnetic field produces an electric current. This process is known as electromagnetic induction.