Exploration 1: Producing Electrical Energy

Which of the following is an example of how electrical energy is used in daily life?

• Turning on an electric light.

• Reading a book.

• Riding a bicycle.

• Cooking food with firewood.

Which energy transformation occurs in a generator?

• Electrical to mechanical

• Mechanical to electrical

• Thermal to mechanical

• Chemical to electrical

Why does the current in a generator change directions regularly?

• Because the magnet moves in a cycle that causes the current to alternate

• Because the wire is heated

• Because the generator stops working

• Because the loop of wire is stationary

A student is asked to describe a way to harness energy and use it to move the elements of a generator. Which of the following would be a correct approach?

• Using wind to rotate a magnet near a coil of wire

• Using a battery to heat the coil

• Using sunlight to directly power the generator without any movement

• Using a stationary magnet and wire with no movement

What is the main purpose of a power plant in the context of electrical energy generation?

• To store electrical energy for later use

• To distribute electrical energy to homes

• To transform mechanical energy into electrical energy

• To reduce atmospheric pollution

Which of the following is a similarity between hydroelectric and wind plants?

• They require a continual fuel source

• They have low maintenance costs

• They must be built in specific locations

• They possibly increase energy production

Why is regular lubrication and maintenance important for wind turbines?

• To increase the speed of the turbine

• To keep the wind turbine performing efficiently

• To reduce the size of the turbine

• To generate more noise

How can wind energy affect the reliability of electrical energy generation?

• Wind energy is always reliable and strong

• Wind energy is never affected by weather conditions

• Wind energy can be variable, which may affect reliability

• Wind energy requires a continual fuel source

What is a possible unintended consequence of using spinning blades of a turbine to generate energy?

• Increased water supply

• Reduced maintenance costs

• The spinning blades might pose a hazard to wildlife

• Generation of toxic waste

What should students consider when designing a wind-powered generator?

• The color of the turbine

• The most important elements of wind-generated energy

• The cost of hydroelectric dams

• The toxicity of the energy produced