Transformer Principles and Calculations

The video tutorial explains how to use the transformer equation to solve a problem involving a step-up transformer. It covers the calculation of secondary voltage and the number of coils, ensuring power conservation, and calculating resistance in the coils. The tutorial emphasizes the importance of understanding ratios and cross-multiplication in solving transformer-related problems.

What is the primary voltage in the given transformer problem?

• 20 volts

• 10 volts

• 40 volts

• 30 volts

If the primary current is 6 amps and the secondary current is 2 amps, what is the ratio of primary to secondary current?

• 1:1

• 1:2

• 3:1

• 1:3

How much is the secondary voltage if the primary voltage is 20 volts and the current ratio is 1:3?

• 60 volts

• 80 volts

• 40 volts

• 20 volts

What is the number of secondary coils if the primary has 50 coils and the current ratio is 1:3?

• 200

• 150

• 100

• 50

In a step-up transformer, how does the secondary voltage compare to the primary voltage?

• It is smaller

• It is the same

• It is larger

• It is zero

What is the power on the primary side if the voltage is 20 volts and the current is 6 amps?

• 60 watts

• 120 watts

• 180 watts

• 240 watts

Why is it important to check the power on both sides of a transformer?

• To confirm power conservation

• To check coil numbers

• To verify current is constant

• To ensure voltage is constant

What is the resistance on the primary side if the voltage is 20 volts and the current is 6 amps?

• 2 ohms

• 3.3 ohms

• 5 ohms

• 6 ohms

How is the resistance on the secondary side calculated if the power is 120 watts and the current is 2 amps?

• 10 ohms

• 20 ohms

• 30 ohms

• 40 ohms

What is the significance of subscripts in transformer equations?

• They show power levels

• They are optional

• They indicate units

• They differentiate primary and secondary values