3.3 electrical terminology Flashcards
(14 cards)
what is voltage
a measure of difference in electrical charge between two points
what is EMF
electromotive force, equal to the terminal potential difference when no current flows
what is the calculation for voltage
V = E/Q
what are the two kinds of electrical voltages
direct current and alternating current
what is it called when a voltage maintains the same polarity over time
DC voltage
what does EMF measure
the energy transferred to the circuit from the other forms of energy by the supply
what is potential difference
the measurement of the energy transferred from the electrical energy to the other forms of energy when a current floes through part of a circuit
what is electrical current
the rate of flow of electrical charge in a certain direction
what is the unit for measuring current
ampere
what is the calculation of current
I = Q/T
what is resistance
the opposition to the flow of electric current and is a measure how much energy is required to cause a current flow
what is the calculation for resistance
R = V/I
what is conventional current flow
the direction in which positive charges move
what is the flow direction from negative to positive called
electron flow or electron current flow
