ScienceAges 13-15

Transformer turns & voltage ratio

Use the ideal transformer ratio Vs ÷ Vp = Ns ÷ Np to calculate secondary output voltage. Review suitability for your learners before teaching.

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Worksheet StudioPractice pack · Ages 13-15

Transformer turns & voltage ratio

Take your time. Show your thinking.

1. An ideal step-up transformer has 1350 primary turns and 6750 secondary turns. If the primary voltage is 110 V, what is the secondary voltage?
110V · 1350T · ? V · 6750T
2. An ideal step-up transformer has 500 primary turns and 3500 secondary turns. If the primary voltage is 170 V, what is the secondary voltage?
170V · 500T · ? V · 3500T
3. An ideal step-up transformer has 200 primary turns and 1600 secondary turns. If the primary voltage is 240 V, what is the secondary voltage?
240V · 200T · ? V · 1600T
4. An ideal step-up transformer has 1000 primary turns and 6000 secondary turns. If the primary voltage is 160 V, what is the secondary voltage?
160V · 1000T · ? V · 6000T
5. An ideal step-up transformer has 100 primary turns and 400 secondary turns. If the primary voltage is 60 V, what is the secondary voltage?
60V · 100T · ? V · 400T
6. An ideal step-up transformer has 500 primary turns and 1500 secondary turns. If the primary voltage is 130 V, what is the secondary voltage?
130V · 500T · ? V · 1500T
7. An ideal step-up transformer has 600 primary turns and 4200 secondary turns. If the primary voltage is 60 V, what is the secondary voltage?
60V · 600T · ? V · 4200T
8. An ideal step-up transformer has 1400 primary turns and 2800 secondary turns. If the primary voltage is 220 V, what is the secondary voltage?
220V · 1400T · ? V · 2800T
9. An ideal step-up transformer has 300 primary turns and 2100 secondary turns. If the primary voltage is 80 V, what is the secondary voltage?
80V · 300T · ? V · 2100T
10. An ideal step-up transformer has 950 primary turns and 1900 secondary turns. If the primary voltage is 240 V, what is the secondary voltage?
240V · 950T · ? V · 1900T
11. An ideal step-up transformer has 1500 primary turns and 3000 secondary turns. If the primary voltage is 30 V, what is the secondary voltage?
30V · 1500T · ? V · 3000T
12. An ideal step-up transformer has 600 primary turns and 4200 secondary turns. If the primary voltage is 170 V, what is the secondary voltage?
170V · 600T · ? V · 4200T

12 questions · Seed 44 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 13-15

Transformer turns & voltage ratio

Answers and reasoning. Review before teaching.

1. An ideal step-up transformer has 1350 primary turns and 6750 secondary turns. If the primary voltage is 110 V, what is the secondary voltage?
550 V
Vs = Vp × (Ns ÷ Np) = 110 × (6750 ÷ 1350) = 550 V.
2. An ideal step-up transformer has 500 primary turns and 3500 secondary turns. If the primary voltage is 170 V, what is the secondary voltage?
1190 V
Vs = Vp × (Ns ÷ Np) = 170 × (3500 ÷ 500) = 1190 V.
3. An ideal step-up transformer has 200 primary turns and 1600 secondary turns. If the primary voltage is 240 V, what is the secondary voltage?
1920 V
Vs = Vp × (Ns ÷ Np) = 240 × (1600 ÷ 200) = 1920 V.
4. An ideal step-up transformer has 1000 primary turns and 6000 secondary turns. If the primary voltage is 160 V, what is the secondary voltage?
960 V
Vs = Vp × (Ns ÷ Np) = 160 × (6000 ÷ 1000) = 960 V.
5. An ideal step-up transformer has 100 primary turns and 400 secondary turns. If the primary voltage is 60 V, what is the secondary voltage?
240 V
Vs = Vp × (Ns ÷ Np) = 60 × (400 ÷ 100) = 240 V.
6. An ideal step-up transformer has 500 primary turns and 1500 secondary turns. If the primary voltage is 130 V, what is the secondary voltage?
390 V
Vs = Vp × (Ns ÷ Np) = 130 × (1500 ÷ 500) = 390 V.
7. An ideal step-up transformer has 600 primary turns and 4200 secondary turns. If the primary voltage is 60 V, what is the secondary voltage?
420 V
Vs = Vp × (Ns ÷ Np) = 60 × (4200 ÷ 600) = 420 V.
8. An ideal step-up transformer has 1400 primary turns and 2800 secondary turns. If the primary voltage is 220 V, what is the secondary voltage?
440 V
Vs = Vp × (Ns ÷ Np) = 220 × (2800 ÷ 1400) = 440 V.
9. An ideal step-up transformer has 300 primary turns and 2100 secondary turns. If the primary voltage is 80 V, what is the secondary voltage?
560 V
Vs = Vp × (Ns ÷ Np) = 80 × (2100 ÷ 300) = 560 V.
10. An ideal step-up transformer has 950 primary turns and 1900 secondary turns. If the primary voltage is 240 V, what is the secondary voltage?
480 V
Vs = Vp × (Ns ÷ Np) = 240 × (1900 ÷ 950) = 480 V.
11. An ideal step-up transformer has 1500 primary turns and 3000 secondary turns. If the primary voltage is 30 V, what is the secondary voltage?
60 V
Vs = Vp × (Ns ÷ Np) = 30 × (3000 ÷ 1500) = 60 V.
12. An ideal step-up transformer has 600 primary turns and 4200 secondary turns. If the primary voltage is 170 V, what is the secondary voltage?
1190 V
Vs = Vp × (Ns ÷ Np) = 170 × (4200 ÷ 600) = 1190 V.

12 questions · Seed 44 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Transformer turns & voltage ratio

Take your time. Show your thinking.

1. An ideal step-up transformer has 1350 primary turns and 6750 secondary turns. If the primary voltage is 110 V, what is the secondary voltage?
110V · 1350T · ? V · 6750T
2. An ideal step-up transformer has 500 primary turns and 3500 secondary turns. If the primary voltage is 170 V, what is the secondary voltage?
170V · 500T · ? V · 3500T
3. An ideal step-up transformer has 200 primary turns and 1600 secondary turns. If the primary voltage is 240 V, what is the secondary voltage?
240V · 200T · ? V · 1600T
4. An ideal step-up transformer has 1000 primary turns and 6000 secondary turns. If the primary voltage is 160 V, what is the secondary voltage?
160V · 1000T · ? V · 6000T
5. An ideal step-up transformer has 100 primary turns and 400 secondary turns. If the primary voltage is 60 V, what is the secondary voltage?
60V · 100T · ? V · 400T
6. An ideal step-up transformer has 500 primary turns and 1500 secondary turns. If the primary voltage is 130 V, what is the secondary voltage?
130V · 500T · ? V · 1500T
7. An ideal step-up transformer has 600 primary turns and 4200 secondary turns. If the primary voltage is 60 V, what is the secondary voltage?
60V · 600T · ? V · 4200T
8. An ideal step-up transformer has 1400 primary turns and 2800 secondary turns. If the primary voltage is 220 V, what is the secondary voltage?
220V · 1400T · ? V · 2800T
9. An ideal step-up transformer has 300 primary turns and 2100 secondary turns. If the primary voltage is 80 V, what is the secondary voltage?
80V · 300T · ? V · 2100T
10. An ideal step-up transformer has 950 primary turns and 1900 secondary turns. If the primary voltage is 240 V, what is the secondary voltage?
240V · 950T · ? V · 1900T
11. An ideal step-up transformer has 1500 primary turns and 3000 secondary turns. If the primary voltage is 30 V, what is the secondary voltage?
30V · 1500T · ? V · 3000T
12. An ideal step-up transformer has 600 primary turns and 4200 secondary turns. If the primary voltage is 170 V, what is the secondary voltage?
170V · 600T · ? V · 4200T

12 questions · Seed 44 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Transformer turns & voltage ratio

Answers and reasoning. Review before teaching.

1. An ideal step-up transformer has 1350 primary turns and 6750 secondary turns. If the primary voltage is 110 V, what is the secondary voltage?
550 V
Vs = Vp × (Ns ÷ Np) = 110 × (6750 ÷ 1350) = 550 V.
2. An ideal step-up transformer has 500 primary turns and 3500 secondary turns. If the primary voltage is 170 V, what is the secondary voltage?
1190 V
Vs = Vp × (Ns ÷ Np) = 170 × (3500 ÷ 500) = 1190 V.
3. An ideal step-up transformer has 200 primary turns and 1600 secondary turns. If the primary voltage is 240 V, what is the secondary voltage?
1920 V
Vs = Vp × (Ns ÷ Np) = 240 × (1600 ÷ 200) = 1920 V.
4. An ideal step-up transformer has 1000 primary turns and 6000 secondary turns. If the primary voltage is 160 V, what is the secondary voltage?
960 V
Vs = Vp × (Ns ÷ Np) = 160 × (6000 ÷ 1000) = 960 V.
5. An ideal step-up transformer has 100 primary turns and 400 secondary turns. If the primary voltage is 60 V, what is the secondary voltage?
240 V
Vs = Vp × (Ns ÷ Np) = 60 × (400 ÷ 100) = 240 V.
6. An ideal step-up transformer has 500 primary turns and 1500 secondary turns. If the primary voltage is 130 V, what is the secondary voltage?
390 V
Vs = Vp × (Ns ÷ Np) = 130 × (1500 ÷ 500) = 390 V.
7. An ideal step-up transformer has 600 primary turns and 4200 secondary turns. If the primary voltage is 60 V, what is the secondary voltage?
420 V
Vs = Vp × (Ns ÷ Np) = 60 × (4200 ÷ 600) = 420 V.
8. An ideal step-up transformer has 1400 primary turns and 2800 secondary turns. If the primary voltage is 220 V, what is the secondary voltage?
440 V
Vs = Vp × (Ns ÷ Np) = 220 × (2800 ÷ 1400) = 440 V.
9. An ideal step-up transformer has 300 primary turns and 2100 secondary turns. If the primary voltage is 80 V, what is the secondary voltage?
560 V
Vs = Vp × (Ns ÷ Np) = 80 × (2100 ÷ 300) = 560 V.
10. An ideal step-up transformer has 950 primary turns and 1900 secondary turns. If the primary voltage is 240 V, what is the secondary voltage?
480 V
Vs = Vp × (Ns ÷ Np) = 240 × (1900 ÷ 950) = 480 V.
11. An ideal step-up transformer has 1500 primary turns and 3000 secondary turns. If the primary voltage is 30 V, what is the secondary voltage?
60 V
Vs = Vp × (Ns ÷ Np) = 30 × (3000 ÷ 1500) = 60 V.
12. An ideal step-up transformer has 600 primary turns and 4200 secondary turns. If the primary voltage is 170 V, what is the secondary voltage?
1190 V
Vs = Vp × (Ns ÷ Np) = 170 × (4200 ÷ 600) = 1190 V.

12 questions · Seed 44 · Age guidance, not curriculum certification