How Electricity Works?/Voltage Explained

What are the two particles found inside the nucleus of an atom?

• Neutrons and Electrons

• Protons and Photons

• Neutrons and Protons

• Protons and Electrons

What is the outer-most shell of an atom known as?

• electron shell

• nucleus shell

• valence shell

• orbital shell

What is the difference between alternating current (AC) and direct current (DC)?

• AC flows in one direction, while DC changes direction periodically.

• AC changes direction periodically, while DC flows in one direction.

• AC and DC have the same direction of flow.

• AC and DC changes direction periodically.

Resistance to the flow of electrons in a circuit is affected by all of the following EXCEPT

• Bent of the wire

• Length of the wire

• 
  Thickness of the wire

• Temperature of the material

Which type of materials have loosely bound electrons that can flow to other atoms?

• Semiconductors

• Superconductors

• Conductors

• Insulators

What is voltage?

• The resistance of a circuit

• The potential difference in a circuit

• The flow of free electrons between atoms

• 
  The pressure in a water pipe

How is voltage measured?

• By measuring the resistance of a circuit

• By counting the number of electrons in a circuit

• By connecting a voltmeter in parallel across two points

• By connecting a voltmeter in series across two points

What happens when there is no voltage in a circuit?

• The circuit becomes superconductive

• 
  The circuit will work just perfectly fine

• 
  The free electrons move randomly between atoms

• The resistance of the circuit increases

How is voltage represented in a voltmeter when measuring electrical circuits?

• 
  With the symbol W and a horizontal line above it

• 
  With the symbol R and a vertical line above it

• With the symbol V and dashes above it

• With the symbol A and a wave line above it

What happens if a 110-volt device is plugged into a 220-volt socket?

• The device will work normally

• The device will burn out

• The device will be dimmer

• The device will flicker but works perfectly fine