Answer the following questions related to an ideal single-phase transformer feeding a…
PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
Answer the following questions related to an ideal single-phase transformer feeding a purely resistive load.
(a) State the law of conservation of energy as it applies to an ideal transformer.
(b) A variable resistor is connected across the secondary winding. Explain qualitatively why increasing the resistance of this load decreases the current drawn from the primary even though the two circuits are not electrically connected.
(c) With the help of energy considerations, explain why using step-up transformers at the generating station and step-down transformers near consumers reduces the I2R loss in transmission lines.