PHYSICAL SCIENCE Flashcards
What is the definition of electricity?SI unit? Symbol of unit of electricity?
The amount of energy needed to move a unit charge(Coulomb)from one point to another point in an electrical circuit
SI unit:Volt
Symbol of unit:V
Electric current:What is the definition of electric current?SI unit? Symbol of unit of current?
The rate of flow of electricity charge in 1 second
SI unit:Ampere
Symbol of unit:A
Resistance:What is the definition of resistance?SI unit? Symbol of unit of resistance?
A measurement of how much the component opposes the flow of electricity
SI unit:Ohm
Symbol of unit:Omega looking think(You probably know)
Electromotive force:What is the definition of electromotive force?SI unit? Symbol of unit of emf?
The amount of energy to push 1 unit of electric charge around the whole circuit
SI unit:Volt
Symbol of unit:emf
Electrical power:What is the definition of electrical power?SI unit? Symbol of unit of electrical power?
Rate of conversion of electrical energy to other forms of energy
SI unit: [Volt]”WATT is this?”
Symbol of unit:W I DROPPED A RECOMB IN F5-
Conventional current flows from the _________ terminal to __________ terminal
Conventional current flows from the positive terminal to negative terminal
Electron flow flows from from the _________ terminal to __________ terminal
Electron flow flows from the negative terminal to the positive terminal
The _______ the cross sectional area, the _______ the resistance.Why?
The greater the cross sectional area, the lower the resistance
When the wire is thicker, there are more units of electrical charges that are flowing through the wire, hence the resistance decreases.
(Don’t need to memorise every single word,memorise the critical points)
The _________ the length of the wire, the __________ the resistance.Why?
The longer the length of the wire, the greater the resistance.
Electrons traveling through a longer wire encounter more atoms and obstacles, leading to more collisions and thus ,the resistance of the wire increases.
What are the colours of the Earth wire?What does it protect?
Green or yellow.To protect the user by grounding any leakage.
What are the colours of the Live wire?What does it protect?
Red or brown.To protect the electrical device from overheating.
PS:THE SWITCH AND FUSE IS CONNECTED TO THE LIVE WIRE
What are the colours of the Neutral wire?What does it protect?
Blue.To completes the path back to the electrical source, allowing current to return to the power source
