Transformers: Current and Voltage Concepts

The video tutorial covers basic calculations for transformers, focusing on both step down and step up types. It explains how to calculate voltages and currents on the primary and secondary sides using various formulas. The tutorial also emphasizes checking power consistency across the transformer. Examples are provided for both step down and step up transformers, illustrating the application of these calculations. The video concludes with a call to action for further learning and engagement on social media platforms.

What is the voltage on the secondary side of a step-down transformer with 1,000 primary turns, 100 secondary turns, and an input of 120 volts?

• 240 volts

• 1,200 volts

• 12 volts

• 120 volts

If you know the output voltage and the number of turns, which formula would you use to find the input voltage in a step-down transformer?

• V2 = V1 * N2/N1

• V1 = V2 * N1/N2

• V2/V1 = N2/N1

• V1/V2 = N1/N2

How do you calculate the primary current if the secondary current is 1.2 amps in a step-down transformer?

• Multiply by 100

• Divide by 100

• Divide by 10

• Multiply by 10

In a step-down transformer, if the primary current is 0.12 amps, what is the secondary current?

• 1.2 amps

• 0.012 amps

• 12 amps

• 0.0012 amps

How do you ensure that power is consistent on both sides of a transformer?

• By dividing voltage by current

• By multiplying voltage and current

• By checking current only

• By checking voltage only

What is the secondary voltage of a step-up transformer with 100 primary turns, 20,000 secondary turns, and an input of 120 volts?

• 12 volts

• 240 volts

• 2,400 volts

• 24,000 volts

Which formula would you use to find the number of turns on the secondary side if you know the primary turns and voltages in a step-up transformer?

• N2 = V1 * N1/V2

• N1 = V2 * N2/V1

• N2 = N1 * V2/V1

• N1 = N2 * V1/V2

What is the primary current if the secondary current is 1 amp in a step-up transformer?

• 0.5 amps

• 1 amp

• 2 amps

• 4 amps

If you know the secondary current and both voltages, which formula helps find the primary current in a step-up transformer?

• I1 = I2 * V2/V1

• I1 = V1 * I2/V2

• I2 = V2 * I1/V1

• I2 = I1 * V1/V2

What is the purpose of using a transformer in electrical circuits?

• To increase resistance

• To change voltage levels

• To decrease current

• To store energy