Generating Electricity Retrieval

Fill in the blank:

• National Grid

• Step Down Transformer

• Home

• Pylon

Which of these are correct statements about the step-up transformer (select as many as needed):

• It allows the electricity to travel further.

• It increases the voltage.

• It increases the speed of the electricity through the cables

• It decreases the current.

Which of these are false statements about the step-up transformer (select as many as needed):

• It reduces energy losses from the cables.

• It increases the voltage.

• It increases the speed of the electricity through the cables

• It decreases the current.

What does a step down transformer do?

• Lower the voltage

• Increase the voltage?

Why do we decrease the voltage before it enters our homes?

• To make it safer

• So its not dangerous

• To give it more power

• To slow the current down

Fill in the missing value:

• 1300 MJ

• 1300

• 700 MJ

• 700

Where could energy be wasted in a coal power station?

• Sound energy due to moving parts, e.g. in the generator.

• Energy lost due to friction between the steam and the turbines.

• Left over heat energy in the steam released in the cooling towers.

A car uses 900W to drive. It uses 700W to move the wheels and loses 300W due to heat in the engine. What is its efficiency?

• 77%

• 33%

• 100%

• 40%

Which sentence best describes Wind power?

• An energy resource used in power stations that have high decommissioning costs.

• An energy resource that is burned in power stations.

• An energy resource that is dependent on the weather

• An energy resource that is used to supply base load demand.

Which sentence best describes the sun?

• An energy source used in power stations that have high decommissioning costs.

• An energy source that is burned in power stations.

• An energy source that drives turbines directly.

• An energy source that supplies solar panels.