Primary voltage and transformers

In summary, primary voltage refers to the initial electrical voltage supplied to a transformer, which is then converted and distributed. A transformer works by using electromagnetic induction to transfer energy between circuits, and its main purpose is to change the voltage level of an electrical current for efficient transmission and distribution. The primary voltage is determined by the power source and desired voltage level, and there are two main types of transformers based on primary voltage: step-up and step-down. Autotransformers also exist, with a single coil serving as both the primary and secondary circuit.
  • #1
zebra1707
107
0
Hi physics gurus

Homework Statement



What should the primary voltage be changed to in order to produce a secondary current of 10 A, given that the V / I ratios for the coils do not change?

Current ratios that I have calculated so far are as follows:

Np (200) Vp (1200) Is (15)
Ns (40) = Vs (240) = Ip (3)

Homework Equations



If focusing on just the IpVp = IsVs ratio - then the solution would be...

The Attempt at a Solution



The primary voltage would be changed to 800 V according to my calculation, I would appreciated your advice.

Cheers P
 
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  • #2


Yes, you are correct
 
  • #3


Many thanks

Cheers P
 

Related to Primary voltage and transformers

1. What is primary voltage?

Primary voltage refers to the initial electrical voltage that is supplied to a transformer. It is the voltage that is sent from the power source, such as a power plant, to the transformer for conversion and distribution.

2. How does a transformer work?

A transformer works by using the principle of electromagnetic induction to transfer energy between two or more circuits. The primary voltage is fed into the primary coil, which creates a magnetic field. This magnetic field then induces a voltage in the secondary coil, which can be stepped up or down depending on the ratio of the number of turns in each coil.

3. What is the purpose of a transformer?

The main purpose of a transformer is to change the voltage level of an electrical current. This is necessary for efficient transmission and distribution of electricity, as different devices and machinery require different voltage levels to operate.

4. How is primary voltage determined?

The primary voltage of a transformer is determined by the power source and the desired voltage level for the secondary circuit. The number of turns in the primary coil is adjusted to achieve the desired voltage level, based on the ratio between the number of turns in the primary and secondary coils.

5. What are the different types of transformers based on primary voltage?

There are two main types of transformers based on primary voltage: step-up transformers and step-down transformers. Step-up transformers increase the voltage from the primary to the secondary circuit, while step-down transformers decrease the voltage. There are also autotransformers, which have a single coil that serves as both the primary and secondary circuit.

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