1. Electro-Magnetic Induction
© D Hoult 2008

2. Transmission of Electrical Energy

4. If the voltage across the bulb is 6V the current will be

5. If the voltage across the bulb is 6V the current will be 1A

6. If the voltage across the bulb is 6V the current will be 1A
Power wasted in R = R I2 = R

10. If the voltage across the bulb is still 6V the current flowing through the bulb is still 1A

11. If the step down transformer is 100% efficient the current flowing through R is

12. If the step down transformer is 100% efficient the current flowing through R is 1/8 A

13. If the step down transformer is 100% efficient the current flowing through R is 1/8 A
Power wasted in R = R I2 =

14. If the step down transformer is 100% efficient the current flowing through R is 1/8 A
Power wasted in R = R I2 = 64

15. 64 times less energy wasted !