Autotransformer Calculations
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23 Terms
What is the formula for calculating secondary voltage?
Vs = Vp × (Ns/Np).
What does Vs represent?
Secondary voltage.
What does Vp represent?
Primary voltage.
What does Ns represent?
Secondary turns.
What does Np represent?
Primary turns.
What is the formula for calculating autotransformer output voltage?
Output voltage = Input voltage × (Tapped turns / Total turns).
What type of transformer has fewer secondary turns than primary turns?
Step-down transformer.
What type of transformer has more secondary turns than primary turns?
Step-up transformer.
An autotransformer has 100 primary turns and 75 tapped secondary turns. Is it step-up or step-down?
Step-down because the secondary has fewer turns.
An autotransformer has 100 primary turns, 75 secondary turns, and 120 V input. What is the output voltage?
90 V.
How do you calculate output voltage with 120 V input, 75 secondary turns, and 100 primary turns?
Vs = 120 × (75/100) = 90 V.
An autotransformer has 100 primary turns and 125 tapped secondary turns. Is it step-up or step-down?
Step-up because the secondary has more turns.
An autotransformer has 100 primary turns, 125 secondary turns, and 120 V input. What is the output voltage?
150 V.
How do you calculate output voltage with 120 V input, 125 secondary turns, and 100 primary turns?
Vs = 120 × (125/100) = 150 V.
What happens to voltage when the secondary-to-primary turns ratio is greater than 1?
Voltage increases.
What happens to voltage when the secondary-to-primary turns ratio is less than 1?
Voltage decreases.
What happens to voltage when the secondary-to-primary turns ratio equals 1?
Voltage stays the same.
If an autotransformer has 200 total turns and 100 tapped turns, what is its turns ratio?
100/200 = 0.5.
If an autotransformer has a turns ratio of 0.5 and an input of 200 V, what is the output voltage?
100 V.
If an autotransformer has 100 total turns and 200 tapped turns, what is its turns ratio?
200/100 = 2.
If an autotransformer has a turns ratio of 2 and an input of 200 V, what is the output voltage?
400 V.
What is the relationship between turns and voltage?
Directly proportional.
What is the relationship between turns and amperage?
Inversely proportional.