National Grid

• Power =

  Current * voltage

  P=IV
• What does a STEP UP TRANSFORMER do?

  Increase Voltage, Decrease current
• What does a STEP DOWN TRANSFORMER do?

  Decrease voltage, Increase current
• Why do we need to decrease current in the National Grid?

  High current= High temperature which is heat loss when traveling through long wires, decreasing current is less heat but we need more voltage to push less current along .