Electricity

Which statement supports that electricity can be very dangerous to humans? Choose 2 correct answers

• It keeps us in contact with others who may live far away.

• Inventors need to create something that could be put between humans and the flow of electricity

• Our bodies are good conductors

• Conductors are usually made from wire.

Which of the following correctly describes one way in which static electricity is different from the electricity used by humans to run things in their homes?

• Static electricity is a quick release of energy.

• Static electricity requires magnets and coils of wire.

• Static electricity flows at a constant rate. D. Static electricity always goes in the same direction.

• Static electricity always goes in the same direction.

Which of these objects will most likely cause static electricity when rubbed together?

• a block of wood and a copper wire

• a cotton towel and plastic wrap

• a magnet and a nickel D. a balloon and hair

• D. a balloon and hair

Select two of the following statements that are examples of electric forces in everyday life.

• Two socks taken out of a dryer cling to each other and must be pulled apart.

• Small objects made of certain materials stick to the outside of a refrigerator.

• A refrigerator causes the temperatures of foods to decrease over time.

• Wet socks eventually dry when they are hung outside on a clothesline.

• A person's hair stands up after being combed on a dry winter day.

What caused the nail to become magnetized in the electromagnet?

• electrical energy

• wind energy

• solar energy

• mechanical energy

A student is designing a simple electrical circuit. She wants to create the circuit using items she has in her house. She finds some wire and a light bulb. Which other item will she need to complete her electrical circuit?

• Motor

• wood

• power source

• switch

Which of the following is the best electrical conductor?

• cotton ball

• packing foam

• plastic toy

• metal nickel

Sharon and Laney each stand with one finger in the same glass of water, not touching each other. When they hold their other hands together, they complete a circuit through which electricity can flow. What does this prove about water?

• It is a good energy conductor.

• It is a good energy insulator.

• It creates electrical energy.

• It blocks electrical energy.

Which of these could create static electricity? A. Plugging in the vacuum B. Running a blender C. Combing your hair D. Turning on a car

• Running a blender

• Combing your hair

• Turning on a car

• Plugging in the vacuum

Which instruction is the BEST use of the scientific method to investigate static electricity?

• fill a balloon with air and hold it near a magnet

• rub one small balloon and one large balloon together

• rub a balloon on a shirt and place it near a wall

• fill one balloon with helium and one with air