Generating Electricity and Transformers

A transformer changes

• energy

• frequency

• power

• voltage

The core of the transformer is made of

• copper

• gold

• iron

• silver

In a fossil-fuel power station, the overall energy conversion is

• chemical to heat

• chemical to electrical

• heat to kinetic

• heat to electrical

Which of the following does a transformer work with?

• Alternating current only

• Direct current only

• Both alternating current and direct current

Why is electricity transmitted at high voltages?

• to reduce energy loss

• to power more appliances

• to be less dangerous to humans

• to be less prone to fires

The input voltage in a transformer is 240,000V while the output voltage is 240V. What type of transformer is this?

• Step Up Transformer

• Step Down Transformer

What is the main source of electricity in Singapore?

• coal

• natural gas

• solar

• oil

There are LESSER number of coils in the primary coil of a transformer than in the secondary coil of a transformer. What type of transformer is it?

• Step Up

• Step Down

What is the normal voltage that is supplied to our homes in Singapore?

• 180 V

• 230 V

• 230,000V

• 400,000V

Which of the following is correct for process 1 after electricity is generated in power stations?

• step down transformer

• high power transmission line

• step up transformer