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Sparks - Unit 1 - Revision
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What does Ω stand for?
Ohm (Measurement unit of resistance)
What does I stand for?
Intensity
What does A stand for?
Ampere
What does V stand for?
Volt (voltage)
What does C stand for?
Coulomb
What's an ion?
It's an atom with more protons than electrons / more electrons than protons
What's power?
It's the rate of flow of electrons.
What's voltage?
It's the measure of charge imbalance between two bodies.
What's a static discharge?
It's the movement of electrons that restores the charge balance between two bodies.
What's charge imbalance?
It's the difference of potential between two bodies (one is positively charged and the other is negatively charged)
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
All electrons orbit at equal distance from the nucleus.
 
False
 
True
Orbiting electrons can move away from the atom if they lose some energy.
 
False
 
True
Electromagnetic sparks and lightnings are two phenomena based on the same atomic property.
 
True
 
False
Atoms never have an electrical charge.
 
False
 
True
How is resistance in plastic?
 
High
 
Low
How is resistance in iron?
 
Low
 
High
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.
What is resistance?
It's the opposition towards the passage of electricity.
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
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 atom's composition?
Nucleus (or core) formed by neutrons and electrons in the centre. Electrons orbiting around the nucleus.
Mention some disadvantages of electricity.
Its production pollutes, it's difficult to store
Mention some advantages of electricity.
It's easy to produce, distribute and it's clean.
When was electricity first observed?
In ancient times (amber experiment)
What is electricity?
It is a flow of charges (or electrons)
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