Flashcards in 8.1 Basic principles of electricity Deck (11)
Electricity is energy made available by
the flow of electrons through a conductor
Atoms consist of
a central nucleus made up of protons and neutrons, which is orbited by rings of electrons.
movement of electrons from atom to atom is known as
Electron flow along a conductor is called
The current or rate of electron flow (numbers of electrons passing a point per second) is measured in
amperes (amps) (symbol I).
The difference in positive and negative potential between the terminals of a power supply (potential difference) is measured in
units of volts (symbol V). Higher voltage results in greater current flow.
All materials, including conductors, will afford some resistance to the flow of electrons. The resistance of a conductor is measured in
ohms (Ω) (symbol R).
Ohms law –
V = I × RI = V/RR = V/I
Mains electricity is from an ___________________ supply
alternating current (AC)
Mains electricity in the UK is a ?V supply, at a frequency of ? Hertz (Hz).
230V 50 Hertz (Hz).