Transformer qs, find turns ration & primary current

In summary, the conversation discusses a step-up transformer that operates from a 12V supply and delivers energy at 240V. The task is to determine the turns ratio of the transformer and the primary current when the secondary winding is connected to a 60W, 240V lamp. The formula P primary = P secondary is used, along with Vp/Vs = Is/Ip = Np/Ns, to solve the problem. It is determined that the transformer is a step-up transformer and the values of Vp, Vs, and P are identified. The conversation concludes by asking if the turns ratio and primary current can now be found.
  • #1
crosbykins
53
0

Homework Statement


A step up transformer is designed to operate from a 12V supply and to deliver energy at 240V. If the secondary winding is connected to a 60W, 240 V lamp, determine:

a) the turns ratio of the transformer
b) the primary current



Homework Equations



P primary = P seconary

Vp/Vs = Is/Ip = Np/Ns

The Attempt at a Solution


-ok...well, I don't know how to do this at all, my textbook only had really straight forward questions where the info for primary and secondary was directly given...please help
 
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  • #2
First question to answer: Is this a step-up or step-down transformer?
 
  • #3
kuruman said:
First question to answer: Is this a step-up or step-down transformer?


-it's a step up

that means Vp is less than Vs, but Ip is greater than Is


i don't know how to identify the P, Vp, Vs from the info...
 
  • #4
What is hooked up to the power supply is the primary. So what is Vp?
 
  • #5
kuruman said:
What is hooked up to the power supply is the primary. So what is Vp?

so Vp is 12V and than I guess Vs is 240V and P is 60W.
 
  • #6
Can you find the turns ratio now? What about the current in the primary?
 

1. What is a transformer?

A transformer is an electrical device that is used to transfer electrical energy from one circuit to another through electromagnetic induction. It consists of two or more coils of insulated wire wound around a core made of magnetic material, such as iron, which helps to transfer the energy from one circuit to another.

2. How do you find the turns ratio of a transformer?

The turns ratio of a transformer can be found by dividing the number of turns in the secondary coil by the number of turns in the primary coil. For example, if the secondary coil has 200 turns and the primary coil has 100 turns, the turns ratio would be 200/100 or 2.

3. Why is the turns ratio important in a transformer?

The turns ratio is important in a transformer because it determines the voltage ratio between the primary and secondary coils. This means that a higher turns ratio will result in a higher output voltage, while a lower turns ratio will result in a lower output voltage.

4. How do you calculate the primary current in a transformer?

The primary current in a transformer can be calculated by dividing the secondary current by the turns ratio. For example, if the secondary current is 5 amps and the turns ratio is 2, the primary current would be 5/2 or 2.5 amps.

5. What factors can affect the turns ratio and primary current in a transformer?

The turns ratio and primary current in a transformer can be affected by factors such as the number of turns in the coils, the type of core material used, the frequency of the alternating current, and any external factors such as temperature or voltage fluctuations.

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