Transmitting electric power over long distances
The problem
How is energy lost?
How does the size of current affect energy loss?
Power = Current x Voltage
P = IV
Calculate the current needed to transmit 50W
1. At 10V
2. At 100V
How does increasing the voltage affect the current?
How does increasing the voltage affect the heat loss?
Transformers
What do transformers do? What does a step up transformer do?
What does a step down transformer do?
How do transformers work?
Do transformers work on ac or dc?
Describe in detail how transformers work. Write down the formula.
Example
A step down transformer
Converts 240 V to 6 V. If there are 1000 turns on the primary windings how many are on the secondary?
Np/Ns = Vin/Vout
Ns/Np = Vout/Vin
