Respuesta :
A secondary coil with 5000 turns will therefore be present. The following transformer has a 220 volt, 30 amp input.
Vp = 12 V input voltage
Vs = 240 V output voltage
Np = 250 primary coil turns.
secondary coil is turned on by Ns = =?
Transformer formula:
Vs/Vp = Ns/Np.
Ns/250 = 240/12
Ns/250 = 20
Ns = 20×250
Ns = 5000
A secondary coil with 5000 turns will therefore be present.
Transformers change voltages from one value to another, as their name implies (The term voltage is used rather than emf, because transformers have internal resistance). For instance, the plug-in unit of many mobile phones, computers, gaming consoles, power tools, and small appliances has a transformer built into it (see Figure 1) that converts 120 V or 240 V AC into the appropriate voltage for the item.
Additionally, transformers are utilized in the power distribution networks at a number of locations. High voltages enable the transmission of power over long distances because, as was previously mentioned, they require less current to transmit a given quantity of power, which reduces line loss. However, high voltages provide more risks, which is why transformers are used.
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