WAEC - Physics (1988 - No. 34)
A transformer with 5500 turns in its primary is used between a 240V a. c supply and a 120V kettle. Calculate the number of turns in the secondary
11000
2750
460
232
10
Förklaring
Ep/Es = np/ns
240/120 = 5500/ns
=> ns = 2750
240/120 = 5500/ns
=> ns = 2750