Every formula pertaining to current, voltage, resistance, amperage, etc. Make sure you have a comprehensive formula sheet so you can answer those questions correctly. You should know the different types of transmission lines (primary, secondary, etc.).Regarding transmission lines, what type of information should you know about the voltages, resistance, power, etc.?
Does anyone know a reliable source to find energy production percentages?(like what percentage hydroelectric or wind accommodates for the world energy production)