# Glencoe Physical Science

## Chapter 8: Magnetism and Its Uses

### Section 3 Self-Check Quiz-Eng.

 1 A __________ is a large wheel that rotates when pushed by water, wind, or steam. Need a Hint? A) coil B) motor C) meter D) turbine 2 Which of the following best describes how electricity is generated for homes? Need a Hint? A) The spinning of a windmill's blades creates electric current without a generator. B) Nuclear reactions cause electric current to flow around the reaction chamber. C) Steam pushes turbine blades in a generator, which changes the mechanical energy into an electric current. D) Water released from a dam generates electric current, which is transformed into mechanical energy. 3 __________ flows in only one direction through a wire. Need a Hint? A) Alternating current B) Direct current C) Voltage D) Electric current 4 Alternating current changes the __________ of the current flow. Need a Hint? A) strength B) amount C) voltage D) direction 5 Which of the following devices can increase or decrease the voltage of an alternating current? Need a Hint? A) generator B) transformer C) battery D) galvanometer 6 The primary coil of a step-up transformer has ten turns and its secondary coil has 100 turns. What is the voltage in the secondary coil if the input voltage in the primary coil is 50 V? Need a Hint? A) 5,500 V B) 4,500 V C) 500 V D) 160 V 7 Why do power plants commonly produce alternating current? Need a Hint? A) Voltage of alternating current can be increased or decreased with transformers. B) It is more economical to produce. C) It does not lose energy as heat when transmitted over long distances. D) Less resistance is created in the wire. 8 Electric current should pass through a __________ after being transmitted by a power plant and before it enters your home. Need a Hint? A) step-up transformer B) generator C) turbine D) step-down transformer