electricity Flashcards
(22 cards)
What is the symbol for an open switch?
What is the symbol for a closed switch
What is the symbol for a cell?
What is the symbol for a lamp?
What is an electric current?
flow of electric charge (electrons) in a circuit
What is a series circuit?
current can only flow in one path. It has no branches.
What is the unit of electric current?
Amp
How do you measure the current in a circuit?
ammeter
What is the symbol for an ammeter?
Is current ever used up in a circuit?
no
What does a parallel circuit contain?
branches
What does the current in the branches , of a parallel circuit , add up to?
total current leaving the cell
What is potential difference (voltage)?
A potential difference of one volt tells us that 1 joule of energy is transferred for each coulomb of charge that is moving through the circuit.
How do we measure potential difference?
voltmeter
How do you calculate energy transfer by components?
Q = I x T
charge = current x time
What is the unit for charge?
C
What is the unit for current?
A
What is the unit for time?
S
What is the equation for energy transfer?
E = Q x V
energy transfer = charge flow x potential difference
What is the unit for energy transfer?
J
What is the unit for charge flow?
C
What is the unit for potential difference?
V
