Foundation Licence Manual Quotes

“In electronic circuits it is often necessary to deliberately limit the current. To do this we use a resistor. The symbol for resistance is ‘R’ and it is measured in ohms (symbol ‘Ω’, the Greek letter omega).”
― Alan Betts, Foundation Licence Manual: for Radio Amateurs

“A one Watt bulb transfers one unit of electrical energy every second to heat and light.”
― Alan Betts, Foundation Licence Manual: for Radio Amateurs

“Working out the power transferred: Power (Watts) = Potential Difference (V) x Current (I) P = V x I”
― Alan Betts, Foundation Licence Manual: for Radio Amateurs

“To deliver the energy more rapidly we can use a battery or power supply with a higher voltage. This will increase the rate at which the electrons move around the circuit. In other words we increase the current in the circuit. Power is a measure of how quickly the device transfers the energy we deliver to it.”
― Alan Betts, Foundation Licence Manual: for Radio Amateurs

“A single cell provides a potential difference (PD) of about 1.5V depending on the chemistry used and several cells form a battery with a higher voltage.”
― Alan Betts, Foundation Licence Manual: for Radio Amateurs

“The milli is one thousandth, 1/1000 or 0·001. The abbreviation is ‘m’. A small current is 5 milliamps or 5mA. That would be 0·005A. A small voltage might be 350mV, or 0·35V. A single cell battery is 1500mV, which should be written as 1·5V.”
― Alan Betts, Foundation Licence Manual: for Radio Amateurs

“Potential Difference (symbol ‘V’) To cause an electric current requires a supply of energy. The electrical potential or voltage as it is often called is a measure of the energy in a quantity of electricity.”
― Alan Betts, Foundation Licence Manual: for Radio Amateurs

“A larger current means more moving electrons so a larger diameter wire is needed.”
― Alan Betts, Foundation Licence Manual: for Radio Amateurs

“Current (symbol ‘I’) The current is a measure of how much electricity is flowing. The unit of measurement is the Amp (A).”
― Alan Betts, Foundation Licence Manual: for Radio Amateurs