WAEC - Physics (2008 - No. 40)
A transformer is required to supply 12 Vrms to operate a toy train set from a 240 Vrms. If the number of turns in the in the secondary coil is 100, calculate the number of turns required in the primary coil
5
12
2000
2400
Explication
\(\frac{E_s}{E_p} = \frac{N_s}{N_p} = \frac{240}{12} \frac{100}{N_p}\)
Np = 5
Np = 5