National Grid

What type of transformer increases voltage?

• Step-Up

• Step-Down

What quantities are changed in a step-up transformer?

• Voltage increases

• Voltage decreases

• Current increases

• Current decreases

Why is the voltage increased in the national grid?

• Stops electricity being lost.

• Stops energy loss by heat

• To increase safety

• Stops energy loss through leaking electricity

What is mains voltage in the UK?

• 240V

• 1.5V

• 120V

• 230V

Which images shows the voltage trace for a.c?

• 
• 

Electrical energy enters the home at approximately...

• 25,000 V
• 132 kV
• 230 V

Step-up transformers...

• improve the efficiency of the national grid
• reduce the voltage to a safe level for the home
• both 

Step-down transformers...

• improve the efficiency of the national grid
• reduce the voltage to a safe level for the home
• both 

In a fuel power station, the turbine converts the heat from the steam into...

• heat energy
• kinetic energy
• electrical energy

In a fuel power station, the generator converts kinetic energy from the turbine into...

• heat energy
• kinetic energy
• electrical energy

Tags

NGSS.HS-PS3-3