Terms, Units And Factors Flashcards
What is voltage?
V: for voltage and it is defined as the number of joules of energy per coulomb of charge. This is the terminal voltage, usually on load.
What is EMF?
MF: Electromotive Force (EMF) is equal to the terminal potential difference when no current flows.
What is potential difference?
PD (or pd): Potential difference is a measure of different potentials (voltages) between 2 or more points in a circuit.
What can Voltage also be represented by?
In equations, voltage is sometimes represented as the letter ‘E’.
How is a volt meter connected to a circuit?
A voltmeter is connected in parallel with the terminals of a power source and/or a load.
What are the two types of volt meter?
Pointer deflection (analogue meter)
Numerical read-out (digital meter)
Possible types of movement or flow of charge carriers in different forms are?
Solid conductive bodies (mainly in metals): electron currents
Conductive liquids: ion currents
Conductive gases: electron and ion currents
A vacuum: electron and ion currents
The speed of movement of charges (e.g. electrons) depends on ?
Conductor material
Conductor cross-section
Potential Difference
Temperature
To measure an electric current, the charge carriers must flow through?
A series-connected ammeter (ampere meter) or current meter.
What is the unit of conductance?
Where ‘G’ is the conductance, measured in Siemens (S) and ‘R’ is the resistance, measured in ohms (Ω).
What is the unit of charge?
The symbol of electrical charge is ‘Q’, and its unit is the Coulomb (C).
