Transformers by FARAH HANIM MAZLAN https://padlet.com/s2161944/mihyxz3rhisyi4p2 Hi Class! Transformers are being used everywhere in our daily life. Let's find out what's exciting about it! en-us 2023-01-24 13:58:48 UTC 2025-11-10 11:41:28 UTC hello@padlet.com http://www.marineinsight.com/wp-content/uploads/2011/07/transformer.jpg 4.3.1. Working Principle of Transformer https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2457502857 Working principle :

  1. Faraday's law of mutual induction is applied on Transformer .
  2. The law states that when a change takes place in the magnetic flux which is linked with a circuit, an electromotive force current will induce in the circuit.
  3. The transformer consists of two separate winding placed over the laminated silicon steel core.
  4. The winding to which AC supply is connected is called primary winding and to which load is connected is called secondary winding.
  5. It works on the alternating current only  for mutual induction between the two winding because require an alternating flux.
  6. An alternating flux sets up in the core of the transformer when the AC supply is given to the primary winding with a certain voltage, It means that it links with the secondary winding that produced an emf that being induced in it aslo called as Mutually Induced emf.
  7. The induced emf has opposite direction to the applied voltage.


]]> 2023-01-26 12:12:24 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2457502857 VIDEO OF TRANSFORMER https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2457505326 https://youtu.be/b6uru1lYUeI




This is the interactive video that shows the principle of working transformer. Enjoy the video!!!


]]> 2023-01-26 12:14:59 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2457505326 4.3.2 Ideal Transformer hafizahkhaan https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458379578 (1) Figure above shows a transformer receives input power from the power supply and supplies the output power to the electrical equipment.

(2) Electrical energy is transferred from the primary circuit to the secondary circuit.

]]> 2023-01-27 01:15:25 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458379578 hafizahkhaan https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458393785 (1) Energy is conserved, so for an ideal transformer the power in the primary coil is similar to the secondary coil.

(2) When a transformer steps up the voltage the current is decreased.

Glossary
a- Vp : Input voltage
b- Vs : Output voltage
c- Ip : Input power
d- Is : Output power]]> 2023-01-27 01:37:13 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458393785 hafizahkhaan https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458401533 (1) An ideal transformer is a transformer that does not experience any loss of energy, the efficiency is 100&.

(2) In practice, a transformer will not be 100% efficient and some energy will be lost, for example as heat.

(3) This means the power in the secondary coil will be less than the power in the primary coil. ]]> 2023-01-27 01:47:50 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458401533 Let's Practice! hafizahkhaan https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458405847 2023-01-27 01:53:45 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458405847 hafizahkhaan https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458420384 A pupil collects the following information on a transformer.

(a) Calculate the efficiency of the transformer.


Note
Do share your answer in comment section below.]]> 2023-01-27 02:15:04 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2458420384 4.3.4 The Uses of Transformers in Daily Life s2161944 https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459589635 Where do you think transformers are being used? 🤔

Please scan the QR code or click the link to answer this question.

Click here to go to mentimeter

]]> 2023-01-28 02:16:42 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459589635 4.3.3 Energy Loss https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459592792
Causes of Energy loses in transformer

Ø  Resistance of coils
Ø  Eddy currents
Ø  Hysteresis
Ø  Leakage of magnetic flux

Ways to reduce Energy losses in transformer

o   Use thicker copper wire so that the resistance of the coil is smaller

o   Use a laminated iron core that consists of thin iron sheets glued together with insulation glue

o   Use soft iron as the core - requires smaller amount of energy to be magnetised

o   The secondary coil is wound on the primary coil - all magnetic flux produced by the primary current will pass through the secondary coil
 

 

]]> 2023-01-28 02:27:33 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459592792 How Eddy Current works !! https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459597465 This video showing on how Eddy Current works. Enjoy yalls!]]> 2023-01-28 02:44:31 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459597465 Step-up and step-down transformers s2161944 https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459604156 A step-up transformer increases the input voltage and delivers it to the load.

A step-down transformer decreases the input voltage at the load.

Now, please give examples of appliances that use step-up transformer and step-down transformer. Click on the link below to answer.

Click here to answer!

]]> 2023-01-28 03:08:18 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459604156 Electrical Energy Transmission and Distribution System s2161944 https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459606574 Please watch the video on how transformers are being used to transmit and distribute electrical energy into our house!]]> 2023-01-28 03:17:08 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459606574 Let's calculate the efficiency of transformer in our phone charger. s2161944 https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459609664 1. Please take a photo of the label on your phone charger.
2. Identify:
  • Input Voltage
  • Output Voltage
  • Input Current
  • Output Current
3. Calculate the efficiency of the transformer inside your phone charger.

Note: Input voltage in a household is usually 240 V

]]> 2023-01-28 03:28:41 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459609664 Example s2161944 https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459613673 Please upload your answer on this Padlet.]]> 2023-01-28 03:45:02 UTC https://padlet.com/s2161944/mihyxz3rhisyi4p2/wish/2459613673