An aquarium filtration pump has a power rating of 46 W when operating at its normal working voltage.
Calculate the amount of electrical energy transferred to the filtration pump in 15 hours.
A student notices that the pump housing becomes warm after it has been operating continuously. They conclude that the pump system cannot be 100% efficient. Explain whether the student’s conclusion is correct.
The pump's control unit is designed to run on a lower voltage than the mains supply, using a step-down transformer. Describe the structure of a step-down transformer.
The step-down transformer reduces the voltage from 230 V to 11.5 V. The secondary current of the transformer is 4.0 A. (i) State the equation linking input power and output power for a transformer, assuming 100% efficiency.
Calculate the primary current.