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• Which of the following modes is the most economical method of transmitting electrical power over long distances?
• The core of a transformer is usually laminated in order to?
• The magnetic relay is a device used for?
• A 120Ω resistor dissipates 8 kJ of heat in 20s. Calculate the current through the resistor.
• Two similar cells are used to light two similar lamps as illustrated in the diagrams above. In which of the circuit diagrams are the lamps brightest?