Fundamentals of Transfomers

Fundamentals of Transformers

1. High voltage causes shocks
2. High current causes wires to heat up.
3. Power-->Voltage x Current

P=VI

To transfer power efficiently, we need to transform it using-->

STEP-UP

TRANSFORMERS and

Step-Down

These change voltage to an appropiate amount for the use of electricity at that moment.

In power stations and power lines we need to consider point "2."above.

• Heating wastes energy.
• So we use high voltages and low currents. But in our homes we need to consider point "1."
• We don't want to get shocked.
• So we use low voltages and high currents.

In each case, POWER is transfered at the same level.

We get the same power from:

1A at 240V

As we do from:

240V at 1V