Electrical Terminology Flashcards
Current is what?
The flow of free electrons through a conductor as they move from atom to atom
Elections and protons have equal and opposite what?
Electrical charges
The symbol for charge is?
Q
The symbol for current is
i
The formula for amperes is?
I = Q / t
The formula for coulombs is?
Q = I t
The force that causes electrons to flow through a conductor is called?
Electromotive force
The symbol for emf is?
E
The symbol for voltage is?
V
The symbol for potential difference is?
pd
Resistance is what?
Property or a conductor that tends to restrict the flow of an electrical current
What is the units of electrical resistance?
Ohm
The symbol for ohm is?
W
Define conductance
The property of a material that allows electrons to flow through it
Examples of conductors are
Silver
Copper
Aluminium
Brads
Zinc
Iron
Examples of insulators
Dry air
Glass
Mica
Rubber
Asbestos
Bakelite
An increased resistance will do what to the current
Decrease
If the resistance of a wire is increased by any of these four factors - size, length, material and temperature the current is?
Decreased
Current is inversely proportional to what?
Resistance
Conventional current is?
flow from positive terminal of an electrical supply, through the conductor or load to the negative terminal
Electron flow is?
In the opposite direction to conventional current flow
