A remote research station receives 24 kW24\text{ kW}24 kW of electric power from a 240 V240\text{ V}240 V supply.
Calculate the current that the research station draws from the supply,
Calculate the electrical energy supplied to the research station in 45 minutes45\text{ minutes}45 minutes.
The power supply to the research station is from a distant generator connected by long-distance transmission cables. The voltage of the transmission cables is very much larger than 240 V240\text{ V}240 V.
Explain why energy losses in the transmission cables are lower when the voltage is high.
452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.