BrainPop - Touch Screens

Which statement about ions is true?

• They are electrically neutral.

• They limit the flow of electricity.

• They carry an electrical charge.

• They make reliable insulators.

A capacitor is to an electric current as a _____ is to a river.

• Dam

• Lake

• Raindrop

• Boat

The rubber coating surrounding an electric wire serves as a(n):

• Conductor

• Insulator

• Capacitor

• Discharge path

Which material would make the best conductor?

• 
• 
• 
• 

In a capacitor, the main function of the insulator is to:

• Allow electrons to flow between conductors

• Release the force of an electrical field

• Filter out positively charged particles

• Build up a stored electrical charge

Capacitors are useful in electrical circuits because they:

• Regulate the flow of electricity

• Repel negative charges

• Reverse the direction of a current

• Require little energy to function

When a touch screen device is on, the screen's built-up electric charge:

• Discharges when the screen is touched

• Is discharged at random intervals

• Continuously discharges and recharges

• Does not discharge

What happens to the ions in your finger as it nears a touch screen?

• They absorb electrons from the screen

• They shift positions

• They are transmitted to the device

• They lose their charge

Which modification is most likely to improve the accuracy of a touch screen?

• Add glare-resistant coating to the display

• Install a longer lasting battery

• Increase the number of conductive wires

• Use more capacitors in its circuitry

Which of these would be essential to designing touch screen gloves?

• Ultra-thin material

• Extra insulation

• Integrated batteries

• Metallic fibers