Core Physics Y10
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Friday 16 May 2014
Friday 9 May 2014
Use of transformers
Transformer Effect
Vin
= Np or Vout = Ns
Vout Ns Vin Np
- A step down
transformer reduces voltage from 240 V (Vin) to 6 V. If there are 1000 turns on the primary
windings (Np), how many
are there on the secondary windings ?
Vout = Ns 6V/240V
= Ns/1000 Ns/1000
= 0.025 Ns = 1000 x 0.025 = 25 turns
Vin Np
- A step down
transformer reduces voltage from 240 V (Vin) to 12 V (Vout). If Np = 200 turns
calculate Ns.
Vout = Ns 12V/240v
= Ns/200 Ns = 12/240 x 200 = 10 turns
Vin Np
- A transformer
has 1000 turns on it’s primary windings and 100 in the secondary . If Vin
is in 20V calculate Vout.
Vout = Ns V
out/20v = 100/1000 Vout=
20 (100/1000) = 2 V
Vin Np
4. In a transformer Np
= 2000 turns and Ns = 50 turns.
If Vin =400 V, calculate Vout.
Vout = Ns V
out/400v = 50/2000 Vout=
400 (50/2000) = 10 V
Vin Np
5. A step up
transformer increases voltage from 4 V to 40 V.
If Np = 100 turns calculate Ns.
Vout = Ns 40V/4v
= Ns/100 Ns = 40/4 x 100 = 1000 turns
Vin Np
6. A step down
transformer reduces voltage from 100 V to 10 V.
If Np = 2000 turns calculate Ns.
Vout = Ns 10V/100v
= Ns/2000 Ns = 10/100 x 2000= 200 turns
Vin Np
7. In a transformer Ns
= 10 turns and Np = 500 turns.
If Vout = 10 V calculate Vin.
Vin/Vout = Np/Ns
rearranging Vin = VoutNp/Ns Vin = 10(500/10) = 500V
8. If Ns =
40 turns and Np = 4000 turns calculate Vin if Vout = 10
V.
Vin/Vout = Np/Ns
rearranging Vin = VoutNp/Ns Vin = 10(4000/40) = 1000V
Friday 25 April 2014
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