Connecting a transformer backward

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In summary, if the transformer is connected the wrong way around the circuit, the voltage supplied to the doorbell will be 120 V. This is because the voltage ratio would be 120/12, or 10, and 10 x 120 = 1200V. However, this high voltage would cause a fuse to blow off, preventing damage.
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fromthepast
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An electric doorbell requires a 12 V, 60 Hz ac supply. If the transformer is connected the wrong way around the circuit, what voltage is supplied to the doorbell?

If figured the voltage ratio would now be 120/12, or 10, and 10 x 120 = 1200V. Is this right?

My other idea was that connecting the transformer the wrong way would simply supply the doorbell with 120 V.

Which is right?

Thanks
 
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  • #2
fromthepast said:
An electric doorbell requires a 12 V, 60 Hz ac supply. If the transformer is connected the wrong way around the circuit, what voltage is supplied to the doorbell?

If figured the voltage ratio would now be 120/12, or 10, and 10 x 120 = 1200V. Is this right?

It is right. And certainly a fuse will blow off to stop this voltage supply.

ehild
 

1. What happens if I connect a transformer backward?

If a transformer is connected backward, it will not function properly and may cause damage to the transformer and the connected devices. The output voltage will be lower than expected and the transformer may overheat.

2. How can I tell if a transformer is connected backward?

If a transformer is connected backward, the input and output terminals will be reversed. You can also use a multimeter to check the voltage across the input and output terminals. If the voltage is lower than expected, it may be an indication of a backward connection.

3. Can connecting a transformer backward be dangerous?

Yes, connecting a transformer backward can be dangerous as it can cause damage to the transformer and connected devices. It can also lead to overheating and potential fire hazards.

4. What should I do if I accidentally connected a transformer backward?

If you accidentally connect a transformer backward, immediately disconnect the power source and check for any damage to the transformer and connected devices. If there is damage, it is recommended to replace the transformer and any damaged devices.

5. What are the consequences of long-term use of a transformer connected backward?

Long-term use of a transformer connected backward can lead to reduced efficiency and increased risk of damage to the transformer and connected devices. It can also result in higher energy consumption and potential safety hazards.

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