GCSE Physics - Transformer Calculations #83

The video tutorial explains how transformers change the potential difference in an electricity supply. It covers the difference between step-up and step-down transformers and introduces two key equations that relate potential difference, current, and the number of turns on the coils. The tutorial includes examples of calculating output voltage and current using these equations.

What is the main function of a step-up transformer?

• To increase the potential difference

• To decrease the potential difference

• To maintain the same potential difference

• To convert AC to DC

In the equations for transformers, what does the symbol 'N' represent?

• Resistance

• Number of turns on the coil

• Current

• Potential difference

If a transformer has 18 turns on its primary coil and 54 turns on its secondary coil, what is the ratio of the number of turns?

• 1:3

• 3:1

• 1:2

• 2:1

Given an input potential difference of 45 volts and a primary coil with 18 turns, what is the output potential difference if the secondary coil has 54 turns?

• 90 volts

• 135 volts

• 45 volts

• 60 volts

If the input current of a transformer is 12 amps, what is the output current given the output potential difference is 135 volts?

• 4 amps

• 3 amps

• 6 amps

• 8 amps