What is electricity?
It is a flow of charges (or electrons)
When was electricity first observed?
In ancient times (amber experiment)
Mention some advantages of electricity.
It's easy to produce, distribute and it's clean.
Mention some disadvantages of electricity.
Its production pollutes, it's difficult to store
What's the atom's composition?
Nucleus (or core) formed by neutrons and electrons in the centre. Electrons orbiting around the nucleus.
Mention some details about subatomic particles.
Neutrons have no electric charge; protons have positive c.; electrons have negative c.; neutrons are lighter than other particles.
What's the difference between static electricity and current electricity?
Static electricity is created by a charge imbalance in multiple directions; current electricity moves in one direction through a conductor
What is resistance?
It's the opposition towards the passage of electricity.
What happens on molecular level when you rub amber with a cloth?
Electrons gain energy, they move towards other material and can attract material with opposite charge.
How is resistance in iron?
High
Low
How is resistance in plastic?
High
Low
Atoms never have an electrical charge.
False
True
Electromagnetic sparks and lightnings are two phenomena based on the same atomic property.
True
False
Orbiting electrons can move away from the atom if they lose some energy.
True
False
All electrons orbit at equal distance from the nucleus.
True
False
If there is a difference of potential between two bodies, a flow of charges is produced by the body with a higher potential.
False
True
