An LED marine beacon has a power rating of 48 W when operating at its normal working voltage.
Calculate the amount of electrical energy transferred to the beacon during 18 hours of continuous night-time operation.
A technician notices that the beacon’s outer casing becomes warm after it has been switched on for some time. They conclude that the beacon cannot be 100% efficient. Explain whether the technician's conclusion is correct.
The beacon is designed to run on a lower voltage than the mains supply, so a step-down transformer is used. Describe the structure of a step-down transformer.
The step-down transformer reduces the voltage from 240 V to 12 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.