Physics for IGCSE & O level - Magnets And Currents (Section 1 - No. 25)
In a step-up transformer, if the primary voltage is 120V and the secondary voltage is 240V, what is the turns ratio?
1:1
1:2
2:1
1:120
Giải thích
The turns ratio is equal to the ratio of the secondary voltage to the primary voltage. Here, 240V/120V is a ratio of 2, thus a turns ratio of 1:2.