Electricity Flashcards
Neutrons, electrons and protons charge?
Electrons- -1
Neutrons- 0
Protons- +1
What is an atom made of?
Nucleus which is made of neutrons and protons
Electron orbits
What does an ammeter do?
Counts how many electrons per second.
What are the rules of positive and negative?
Positive attracts negative
Positive repels positive
What sort of materials are good electrical conductors?
Metals
Graphite is an exception
What materials are insulators?
Rubber,plastic,wood,glass
What is a free flow of electrons called?
Current
What must happen for a neutral object to become positively/negatively charged?
Positive- lose electrons
Negative- gain electrons
Know symbols
Why are metals good conductors?
Free electrons.
What is ohms law?
V is directly proportional to I.
Current through a fixed resistor is directly proportional to the voltage across it, provided the temperature stays the same.
How can current be calculated?
V = IR.
Current = charge/time.
Q= IT
What does current and voltage do in a series circuit?
Current- same
Voltage-splits
What does current and voltage do in a parallel circuit?
Current- splits
Voltage- same
What is the total resistance calculation in series?
RT = R1 + R2
