A high-voltage transmission line delivers power to a factory via a step-down transformer. The primary side of the transformer is connected to the 22 kV transmission line, and the secondary side provides 415 V to the factory’s main distribution board. During peak operation, the factory draws a total power of 800 kW. Assuming the transformer is ideal, analyse the impact on the primary side current if the factory’s power demand suddenly drops to 400 kW due to a shutdown of some machinery. Calculate the percentage change in the primary side current, clearly showing all steps and reasoning.
Marking your answer...
This may take a few seconds
Sign up for free to see your full marking breakdown and personalised study recommendations.
Create Free Account Log inThis is a free VCE Units 3 & 4 Physics practice question worth 5 marks, testing your understanding of Transformer action. It falls under How are fields used in electricity generation? in Unit 3: How do fields explain motion and electricity?. Submit your answer above to receive instant AI-powered marking and personalised feedback.
In this unit students use Newton’s laws to investigate motion in one and two dimensions. They explore the concept of the field as a model used by physicists to explain observations of motion of objects not in apparent contact. Students compare and contrast three fundamental fields – gravitational, magnetic and electric – and how they relate to one another. They consider the importance of the field to the motion of particles within the field. Students examine the production of electricity and its delivery to homes. They explore fields in relation to the transmission of electricity over large distances and in the design and operation of particle accelerators. A student-designed practical investigation involving the generation of primary data and including one continuous, independent variable related to fields, motion or light is undertaken either in Unit 3 or Unit 4, or across both Units 3 and 4, and is assessed in Unit 4, Outcome 2. The design, analysis and findings of the investigation are presented in a scientific poster format.
In this area of study, students use empirical evidence and models of electric, magnetic and electromagnetic effects to explain how electricity is produced and delivered to homes. They explore the transformer as critical to the performance of electrical distribution systems in minimising power loss.
Analyse transformer action with reference to electromagnetic induction for an ideal transformer: Vs/Vp = Ns/Np, IpVp = IsVs.
All free, all instant AI marking.
A step-down transformer in a phone charger converts 240 V AC from the mains supply to 5 V AC to charge the phone's battery. If the primary c…
A remote Australian cattle station uses an ideal step-down transformer to power its homestead. The transformer steps down the voltage from a…
An ideal transformer has a primary voltage of 240 V and a secondary voltage of 12 V. Which statement correctly describes the relationship be…
An ideal transformer has a primary coil with 100 turns and a secondary coil with 500 turns. If the voltage across the primary coil is 20 V,…
A remote sensor is powered by a 12 V AC power supply. To ensure safe and efficient operation of the sensor, a technician uses an ideal step-…
A remote community relies on a step-down transformer to reduce the voltage from a long-distance transmission line to a usable level for home…
StudyPulse has thousands of VCE Physics questions with full AI feedback, mark breakdowns, progress tracking, and study notes across every Key Knowledge point including Transformer action.
