Numerical Problems | Chapter 19 Electromagnetism | 10th Physics NBF | New Book | FBISE

For latest videos, click on the following link: https://whatsapp.com/channel/0029VaGr... Chapter 10: Heat Capacity & Modes of Heat Transfer    • CH10: Heat Capacity & Modes Of Heat Transfer   Chapter 11: Thermal Transformations    • CH11: Thermal Transformations   Chapter 12: Waves    • CH12: Waves   Chapter 13: Sound    • CH13: Sound   Chapter 14: Optics    • CH14: Optics   Chapter 15: Electrostatics    • CH15: Electrostatics   Chapter 16: Current Electricity    • CH16: Current Electricity   Chapter 17: Electric Circuits    • CH17: Electric Circuits   Chapter 18 Electronics    • Chapter 18 Electronics   Chapter 19 Electromagnetism    • CH19: Electromagnetism   1. A step-up transformer has a turn ratio of 1:100. An alternating supply of 20V is connected across the primary coil. What is the secondary voltage? 2. A step-down transformer has a turns ratio of 100:1. An ac voltage of amplitude 170V is applied to the primary. What is the voltage across the secondary? 3. Calculate the input voltage if it draws 0.5A. Also calculate turn ratio of primary to secondary coil if a transformer is rated for an output of 100W and 8.3A. Also identify the type of transformer. 4. Calculate the output power and output current of the following step-down transformer. The value of input current is 0.050A (Assuming that the transformer is 100% efficient). 5. A transformer in an adapter steps up a 115V to the 230V needed for a hair dryer. A current of 5A flows through the hairdryer. Assuming that the transformer is 100% efficient, calculate the current drawn from the mains supply.