Understanding Signals and Pixels

What is an electronic signal?

• A type of wave that travels through the air

• Information sent as a pattern in a controlled flow of current through a circuit

• A device used to amplify sound

• A type of battery used in circuits

What is a wave pulse?

• A continuous wave that travels indefinitely

• A pulse of energy that travels through the circuit when it is closed

• A type of digital signal

• A method of storing data

What are electromagnetic signals?

• Information sent as patterns of electromagnetic waves

• A type of analog signal

• A method of converting sound to light

• A type of battery

What is an analog signal?

• A signal that allows for a record of numerical values at set intervals

• A signal that allows for continuous record of some kind of action

• A type of digital signal

• A method of storing data in pixels

What is a digital signal?

• A signal that allows for continuous record of some kind of action

• A signal that allows for a record of numerical values of an action at a set of continuous intervals

• A type of wave pulse

• A method of converting sound to light

What are pixels?

• Large shapes that make up a small picture

• Small uniform shapes that are combined to make a larger picture

• A type of digital signal

• A method of storing sound

Which of the following is true about digital signals?

• They are continuous and do not have intervals

• They result in a series of numbers

• They are used to amplify sound

• They are a type of wave pulse

How do analog signals differ from digital signals?

• Analog signals are numerical, digital signals are continuous

• Analog signals are continuous, digital signals are numerical

• Both are the same

• Analog signals are used in computers, digital signals are not

What happens when a circuit is closed?

• A wave pulse is created

• The circuit stops working

• The circuit becomes an analog signal

• The circuit becomes a digital signal

Which of the following best describes the function of pixels in a digital image?

• They store sound information

• They are small uniform shapes that are combined to make a larger picture

• They are used to create wave pulses

• They are used to send electromagnetic signals