When the resistance of a purely resistive load connected across the secondary of an…
PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
When the resistance of a purely resistive load connected across the secondary of an ideal step-down transformer is doubled while the primary supply voltage remains unchanged, how does the rms current in the primary change?
(a) It doubles.
(b) It decreases by a factor of 2.
(c) It remains unchanged.
(d) It halves.